Merge pull request #95 from RETROTEC-AG/pr/locale-des-gui-users-ermitteln

Locale des GUI-Users ermitteln

classes/Components/I18n/Bootstrap.php

@@ -0,0 +1,151 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n;
+
+use Xentral\Components\Database\Database;
+use Xentral\Components\Http\Request;
+use Xentral\Components\Http\Session\Session;
+use Xentral\Core\DependencyInjection\ServiceContainer;
+
+/**
+ * Factory for localization object.
+ *
+ * @see Localization
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+final class Bootstrap
+{
+    /**
+     * @return array
+     */
+    public static function registerServices(): array
+    {
+        return [
+            'Localization' => 'onInitLocalization',
+        ];
+    }
+    
+    
+    
+    /**
+     * Replaces umlauts with their 2 character representation.
+     *
+     * @param string $string
+     *
+     * @return array|string|string[]
+     */
+    public static function replaceUmlauts(string $string)
+    {
+        $search = ['ä', 'ö', 'ü', 'Ä', 'Ö', 'Ü', 'ß'];
+        $replace = ['ae', 'oe', 'ue', 'Ae', 'Oe', 'Ue', 'ss'];
+        return str_replace($search, $replace, $string);
+    }
+    
+    
+    
+    /**
+     * Find the language information from the given string.
+     *
+     * @param string $lang
+     *
+     * @return array|null
+     */
+    public static function findLanguage(string $lang): ?array
+    {
+        $subject = strtolower($lang);
+        foreach ((new Iso639()) as $key => $val) {
+            if (array_filter($val, function ($str) use ($subject) {
+                return $str && ((strtolower($str) == $subject) || (self::replaceUmlauts(strtolower($str)) == $subject));
+            })) {
+                return $val;
+            }
+        }
+        return null;
+    }
+    
+    
+    
+    /**
+     * Find the region information from the given string.
+     *
+     * @param string $region
+     *
+     * @return array|null
+     */
+    public static function findRegion(string $region): ?array
+    {
+        $subject = strtolower($region);
+        foreach ((new Iso3166()) as $key => $val) {
+            if (array_filter($val, function ($str) use ($subject) {
+                return $str && ((strtolower($str) == $subject) || (self::replaceUmlauts(strtolower($str)) == $subject));
+            })) {
+                return $val;
+            }
+        }
+        return null;
+    }
+    
+    
+    
+    /**
+     * This is the factory for the Localization object.
+     *
+     * @param ServiceContainer $container
+     *
+     * @return Localization
+     */
+    public static function onInitLocalization(ServiceContainer $container): Localization
+    {
+        /** @var Request $request */
+        $request = $container->get('Request');
+        /** @var Session $session */
+        $session = $container->get('Session');
+        /** @var \erpooSystem $app */
+        $app = $container->get('LegacyApplication');
+        /** @var Database $db */
+        $db = $container->get('Database');
+        
+        $config=[];
+        $firmaLang=null;
+        $firmaRegion=null;
+        // Get language from system settings and normalize to 3-letter-code and 2-letter-code
+        if ($firmaLang = self::findLanguage($app->erp->Firmendaten('preferredLanguage'))) {
+            $config[Localization::LANGUAGE_DEFAULT] = $firmaLang[Iso639\Key::ALPHA_3];
+        }
+        
+        // Get region from system settings and normalize to 2-letter-code
+        if ($firmaLang && ($firmaRegion = self::findRegion($app->erp->Firmendaten('land')))) {
+            $config[Localization::LOCALE_DEFAULT] = "{$firmaLang[Iso639\Key::ALPHA_2]}_{$firmaRegion[Iso3166\Key::ALPHA_2]}";
+        }
+        
+        
+        // Get User
+        $usersettings = [];
+        if ($user = $app->User) {
+            // Get User's address from user
+            $userAddress = $db->fetchRow(
+                $db->select()->cols(['*'])->from('adresse')->where('id=:id'),
+                ['id' => $user->GetAdresse()]
+            );
+            
+            // Get language from user account and normalize to 3-letter-code and 2-letter-code
+            if ($userLang = self::findLanguage($user->GetSprache())) {
+                $usersettings['language'] = $userLang[Iso639\Key::ALPHA_3];
+            }
+            
+            // Get region from user account and normalize to 2-letter-code
+            if ($userLang && ($userRegion = self::findRegion($userAddress['land']))) {
+                $usersettings['locale'] = "{$userLang[Iso639\Key::ALPHA_2]}_{$userRegion[Iso3166\Key::ALPHA_2]}";
+            }
+        }
+        
+        // Create Localization object
+        return new Localization($request, $session, $usersettings, $config);
+    }
+}

classes/Components/I18n/Dataaccess/ArrayAccessTrait.php

@@ -0,0 +1,73 @@
+<?php
+/*
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Dataaccess;
+
+/**
+ * Provides array access functions to the data provider.
+ *
+ * @see      \ArrayAccess
+ * @see      DataProvider
+ * @see      DataProviderInterface
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+trait ArrayAccessTrait
+{
+    /**
+     * Whether an offset exists.
+     *
+     * @param string $offset
+     *
+     * @return bool
+     */
+    public function offsetExists($offset): bool
+    {
+        return array_key_exists($offset, $this->DataProvider_DATA);
+    }
+    
+    
+    
+    /**
+     * Offset to retrieve.
+     *
+     * @param string $offset
+     *
+     * @return array
+     */
+    public function offsetGet($offset): array
+    {
+        return $this->DataProvider_DATA[$offset];
+    }
+    
+    
+    
+    /**
+     * Assign a value to the specified offset.
+     * No function since data set is read only.
+     *
+     * @param string $offset
+     * @param array  $value
+     */
+    public function offsetSet($offset, $value)
+    {
+// $this->DataProvider_DATA[$offset]=$value;
+    }
+    
+    
+    
+    /**
+     * Unset an offset.
+     * No function since data set is read only.
+     *
+     * @param string $offset
+     */
+    public function offsetUnset($offset)
+    {
+// unset($this->DataProvider_DATA[$offset]);
+    }
+}

classes/Components/I18n/Dataaccess/CountableTrait.php

@@ -0,0 +1,30 @@
+<?php
+/*
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Dataaccess;
+
+/**
+ * Provides countable functions to the data provider.
+ *
+ * @see      \Countable
+ * @see      DataProvider
+ * @see      DataProviderInterface
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+trait CountableTrait
+{
+    /**
+     * Counts the number of records in the private $data array.
+     *
+     * @return int Number of records
+     */
+    public function count(): int
+    {
+        return count($this->DataProvider_DATA);
+    }
+}

classes/Components/I18n/Dataaccess/DataFilter.php

@@ -0,0 +1,80 @@
+<?php
+/*
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Dataaccess;
+
+
+/**
+ * Abstract filter class.
+ *
+ * @see      DataFilterInterface
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+abstract class DataFilter implements DataFilterInterface
+{
+    /**
+     * Pointer to next filter in chain.
+     *
+     * @var DataFilterInterface
+     */
+    private $nextFilter = null;
+    
+    
+    
+    /**
+     * {@inheritDoc}
+     * @see \Xentral\Components\I18n\Dataaccess\DataFilterInterface::then()
+     */
+    public function then(DataFilterInterface $filter): DataFilterInterface
+    {
+        if (!$this->nextFilter) {
+            $this->nextFilter = $filter;
+        } else {
+            $this->nextFilter->then($filter);
+        }
+        return $this;
+    }
+    
+    
+    
+    /**
+     * Applies the filter to the data and executes the next filter
+     * if present.
+     *
+     * @see \Xentral\Components\I18n\Dataaccess\DataFilterInterface::__invoke()
+     */
+    public function __invoke(array $data): array
+    {
+// 		echo get_called_class()."::__invoke(\$data)".PHP_EOL;
+        
+        $filteredData = [];
+        foreach ($data as $key => $val) {
+            if ($this->selectItem($key, $val)) {
+                $filteredData[$key] = $val;
+            }
+        }
+        
+        if ($this->nextFilter) {
+            $filteredData = ($this->nextFilter)($filteredData);
+        }
+        return $filteredData;
+    }
+    
+    
+    
+    /**
+     * Check if the current item is to be selected for
+     * the dataset.
+     *
+     * @param mixed $key
+     * @param mixed $val
+     *
+     * @return bool
+     */
+    abstract protected function selectItem(&$key, &$val): bool;
+}

classes/Components/I18n/Dataaccess/DataFilterInterface.php

@@ -0,0 +1,38 @@
+<?php
+/*
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Dataaccess;
+
+
+/**
+ * Filter Interface.
+ *
+ * @see      DataFilter
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+interface DataFilterInterface
+{
+    /**
+     * Add a filter to the end of the filter chain.
+     *
+     * @param DataFilterInterface $filter Filter to add
+     *
+     * @return DataFilterInterface Start of filter chain
+     */
+    function then(DataFilterInterface $filter): DataFilterInterface;
+    
+    
+    
+    /**
+     * Applies the filter to the data and executes the next filter
+     * if present.
+     *
+     * @see \Ruga\I18n\Dataaccess\DataFilterInterface::__invoke()
+     */
+    function __invoke(array $data): array;
+}

classes/Components/I18n/Dataaccess/DataProvider.php

@@ -0,0 +1,125 @@
+<?php
+/*
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Dataaccess;
+
+use ArrayAccess;
+use Countable;
+use Iterator;
+
+/**
+ * Abstract implementation of a general data provider.
+ *
+ * @see      DataProviderInterface
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+abstract class DataProvider implements Countable, Iterator, ArrayAccess, DataProviderInterface
+{
+    use CountableTrait;
+    use IteratorTrait;
+    use ArrayAccessTrait;
+    
+    
+    /**
+     * Holds filtered data.
+     *
+     * @var mixed
+     */
+    private $DataProvider_DATA = null;
+    
+    
+    
+    /**
+     * Create the object and apply data filter.
+     *
+     * @param DataFilterInterface|null $filter
+     */
+    public function __construct(DataFilterInterface $filter = null)
+    {
+        if ($filter) {
+            $this->DataProvider_DATA = $filter($this->getOriginalData());
+        } else {
+            $this->DataProvider_DATA = $this->getOriginalData();
+        }
+    }
+    
+    
+    
+    /**
+     * Returns the original data array).
+     * Raw data before any filtering takes place.
+     *
+     * @return array
+     */
+    abstract protected function getOriginalData(): array;
+    
+    
+    
+    /**
+     * Returns an array suitable for select fields.
+     * The key of the filtered data set is used as key of the
+     * array and $desiredName field is used as value.
+     *
+     * @param string $desiredName
+     *
+     * @return array;
+     */
+    public function getMultiOptions($desiredName = 'NAME_deu'): array
+    {
+        $a = [];
+        foreach ($this as $key => $l) {
+            $a[$key] = $l[$desiredName];
+        }
+        return $a;
+    }
+    
+    
+    
+    /**
+     * Returns the field $desiredName from the record $id.
+     *
+     * @param mixed  $id
+     * @param string $desiredName
+     *
+     * @return string
+     */
+    public function getString($id, $desiredName): string
+    {
+        if (!isset($this[$id])) {
+            throw new Exception\OutOfRangeException("Index '{$id}' not found");
+        }
+        $d = $this[$id];
+        if ($desiredName) {
+            if ($desiredName == 'POST') {
+                return strtoupper($this->getString($id, 'NAME_eng'));
+            }
+            return $d[$desiredName];
+        }
+        throw new Exception\OutOfRangeException("No '{$desiredName}' data for '{$id}'");
+    }
+    
+    
+    
+    /**
+     * Returns the item at position $id.
+     *
+     * @param string $id
+     *
+     * @return mixed
+     */
+    public function getData($id)
+    {
+        if (empty($id)) {
+            return null;
+        }
+        if (!isset($this[$id])) {
+            throw new Exception\OutOfRangeException("Index '{$id}' not found.");
+        }
+        return $this[$id];
+    }
+}

classes/Components/I18n/Dataaccess/DataProviderInterface.php

@@ -0,0 +1,53 @@
+<?php
+/*
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Dataaccess;
+
+
+/**
+ * Interface to the general data provider class.
+ *
+ * @see      DataProvider
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+interface DataProviderInterface
+{
+    /**
+     * Returns an array suitable for select fields.
+     * The key of the filtered data set is used as key of the
+     * array and $desiredName field is used as value.
+     *
+     * @param string $desiredName
+     *
+     * @return array;
+     */
+    public function getMultiOptions($desiredName): array;
+    
+    
+    
+    /**
+     * Returns the field $desiredName from the record $id.
+     *
+     * @param mixed  $id
+     * @param string $desiredName
+     *
+     * @return string
+     */
+    public function getString($id, $desiredName): string;
+    
+    
+    
+    /**
+     * Returns the item at position $id.
+     *
+     * @param string $id
+     *
+     * @return mixed
+     */
+    public function getData($id);
+}

classes/Components/I18n/Dataaccess/Exception/OutOfRangeException.php

@@ -0,0 +1,14 @@
+<?php
+/*
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Dataaccess\Exception;
+
+class OutOfRangeException extends \OutOfRangeException
+{
+    
+}

classes/Components/I18n/Dataaccess/IteratorTrait.php

@@ -0,0 +1,100 @@
+<?php
+/*
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Dataaccess;
+
+/**
+ * Provides iterator functions to the data provider.
+ *
+ * @see      \Iterator
+ * @see      DataProvider
+ * @see      DataProviderInterface
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+trait IteratorTrait
+{
+    /**
+     * Index of the current element's key.
+     *
+     * @var string
+     */
+    private $IteratorTrait_index = null;
+    
+    /**
+     * Array of keys of the data set.
+     *
+     * @var array
+     */
+    private $IteratorTrait_keys = null;
+    
+    
+    
+    /**
+     * Return the current element.
+     *
+     * @return mixed
+     */
+    public function current()
+    {
+        return $this->valid() ? $this->DataProvider_DATA[$this->key()] : null;
+    }
+    
+    
+    
+    /**
+     * Return the key of the current element.
+     *
+     * @return mixed
+     */
+    public function key()
+    {
+        return static::valid() ? $this->IteratorTrait_keys[$this->IteratorTrait_index] : null;
+    }
+    
+    
+    
+    /**
+     * Move forward to next element.
+     *
+     * @return bool false if invalid
+     */
+    public function next()
+    {
+        $this->IteratorTrait_index++;
+        if (!$this->valid()) {
+            $this->IteratorTrait_index = null;
+        }
+        return $this->valid();
+    }
+    
+    
+    
+    /**
+     * Rewind the Iterator to the first element.
+     */
+    public function rewind()
+    {
+        $this->IteratorTrait_keys = array_keys($this->DataProvider_DATA);
+        sort($this->IteratorTrait_keys);
+        $this->IteratorTrait_index = 0;
+    }
+    
+    
+    
+    /**
+     * Checks if current position is valid.
+     *
+     * @return bool
+     */
+    public function valid(): bool
+    {
+        return ($this->IteratorTrait_index !== null)
+            && array_key_exists($this->IteratorTrait_index, $this->IteratorTrait_keys)
+            && array_key_exists($this->IteratorTrait_keys[$this->IteratorTrait_index], $this->DataProvider_DATA);
+    }
+}

classes/Components/I18n/Exception/LanguageNotInitializedException.php

@@ -0,0 +1,14 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Exception;
+
+class LanguageNotInitializedException extends \RuntimeException
+{
+    
+}

classes/Components/I18n/Exception/UnsupportedLocaleStringException.php

@@ -0,0 +1,14 @@
+<?php
+/*
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Exception;
+
+class UnsupportedLocaleStringException extends \RuntimeException
+{
+    
+}

classes/Components/I18n/Iso3166.php

@@ -0,0 +1,32 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n;
+
+use Xentral\Components\I18n\Dataaccess\DataProvider;
+
+/**
+ * Country Codes - ISO 3166.
+ * Loads the data and holds the filtered (if desired) list.
+ *
+ * @see      https://www.iso.org/iso-3166-country-codes.html
+ * @see      DataProvider
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * @license  AGPL-3.0-only
+ */
+class Iso3166 extends DataProvider
+{
+    /**
+     * {@inheritDoc}
+     * @see \Xentral\Components\I18n\Dataaccess\DataProvider::getOriginalData()
+     */
+    protected function getOriginalData(): array
+    {
+        return include(__DIR__ . '/data/Iso3166data.php');
+    }
+}

classes/Components/I18n/Iso3166/Filter/All.php

@@ -0,0 +1,31 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Iso3166\Filter;
+
+use Xentral\Components\I18n\Dataaccess\DataFilter;
+use Xentral\Components\I18n\Dataaccess\DataFilterInterface;
+
+/**
+ * This filter returns all records from the data set (aka dummy filter).
+ *
+ * @see      \Xentral\Components\I18n\Dataaccess\DataFilter
+ * @see      \Xentral\Components\I18n\Dataaccess\DataFilterInterface
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+class All extends DataFilter implements DataFilterInterface
+{
+    /**
+     * {@inheritDoc}
+     * @see \Xentral\Components\I18n\Dataaccess\DataFilterInterface::selectItem()
+     */
+    function selectItem(&$key, &$val): bool
+    {
+        return true;
+    }
+}

classes/Components/I18n/Iso3166/Filter/CentralEurope.php

@@ -0,0 +1,41 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Iso3166\Filter;
+
+use Xentral\Components\I18n\Dataaccess\DataFilterInterface;
+use Xentral\Components\I18n\Iso3166\Key;
+
+
+/**
+ * Applies a filter to only select central european countries.
+ *
+ * @see      Custom
+ * @see      \Xentral\Components\I18n\Dataaccess\DataFilter
+ * @see      \Xentral\Components\I18n\Dataaccess\DataFilterInterface
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+class CentralEurope extends Custom implements DataFilterInterface
+{
+    /**
+     * Countries in Europe.
+     *
+     * @var array
+     */
+    const CentralEurope_Countries = ['CHE', 'DEU', 'AUT', 'ITA', 'FRA', 'ESP', 'PRT', 'GBR'];
+    
+    
+    
+    /**
+     * Set predefined values.
+     */
+    public function __construct()
+    {
+        parent::__construct(static::CentralEurope_Countries, Key::ALPHA_3);
+    }
+}

classes/Components/I18n/Iso3166/Filter/ChangeKey.php

@@ -0,0 +1,55 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Iso3166\Filter;
+
+use Xentral\Components\I18n\Dataaccess\DataFilterInterface;
+use Xentral\Components\I18n\Dataaccess\DataFilter;
+
+
+/**
+ * This filter can be used to change the main key
+ * of the data set.
+ *
+ * @see      \Xentral\Components\I18n\Dataaccess\DataFilter
+ * @see      \Xentral\Components\I18n\Dataaccess\DataFilterInterface
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+class ChangeKey extends DataFilter implements DataFilterInterface
+{
+    /**
+     * New key to use for the data set.
+     *
+     * @var string
+     */
+    private $ChangeKey_key = null;
+    
+    
+    
+    /**
+     * Initialize filter and set the new key.
+     *
+     * @param mixed $key
+     */
+    public function __construct($key)
+    {
+        $this->ChangeKey_key = $key;
+    }
+    
+    
+    
+    /**
+     * {@inheritDoc}
+     * @see \Xentral\Components\I18n\Dataaccess\DataFilterInterface::selectItem()
+     */
+    protected function selectItem(&$key, &$val): bool
+    {
+        $key = $val[$this->ChangeKey_key];
+        return true;
+    }
+}

classes/Components/I18n/Iso3166/Filter/Custom.php

@@ -0,0 +1,63 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Iso3166\Filter;
+
+use Xentral\Components\I18n\Dataaccess\DataFilter;
+use Xentral\Components\I18n\Dataaccess\DataFilterInterface;
+
+
+/**
+ * Apply a custom filter to the data set.
+ *
+ * @see      \Xentral\Components\I18n\Dataaccess\DataFilter
+ * @see      \Xentral\Components\I18n\Dataaccess\DataFilterInterface
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+class Custom extends DataFilter implements DataFilterInterface
+{
+    /**
+     * Array of wanted values.
+     *
+     * @var array
+     */
+    private $Custom_values = null;
+    
+    /**
+     * Key to check for the values in $this->Custom_values.
+     *
+     * @var string
+     */
+    private $Custom_key = null;
+    
+    
+    
+    /**
+     * Set values for filter.
+     *
+     * @param array $values
+     * @param mixed $key
+     */
+    public function __construct(array $values, $key)
+    {
+        $this->Custom_values = $values;
+        $this->Custom_key = $key;
+    }
+    
+    
+    
+    /**
+     * {@inheritDoc}
+     * @see \Xentral\Components\I18n\Dataaccess\DataFilterInterface::selectItem()
+     */
+    protected function selectItem(&$key, &$val): bool
+    {
+        $needle = $val[$this->Custom_key];
+        return in_array($needle, $this->Custom_values);
+    }
+}

classes/Components/I18n/Iso3166/Filter/Europe.php

@@ -0,0 +1,32 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Iso3166\Filter;
+
+use Xentral\Components\I18n\Dataaccess\DataFilterInterface;
+use Xentral\Components\I18n\Iso3166\Key;
+
+
+/**
+ * Applies a filter to only select european countries.
+ *
+ * @see      Custom
+ * @see      \Xentral\Components\I18n\Dataaccess\DataFilter
+ * @see      \Xentral\Components\I18n\Dataaccess\DataFilterInterface
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+class Europe extends Custom implements DataFilterInterface
+{
+    /**
+     * Set predefined values.
+     */
+    public function __construct()
+    {
+        parent::__construct(['150'], Key::REGION_CODE);
+    }
+}

classes/Components/I18n/Iso3166/Key.php

@@ -0,0 +1,75 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Iso3166;
+
+
+/**
+ * Keys for the iso3166 list.
+ *
+ * @see      \Xentral\Components\I18n\Iso3166
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+abstract class Key/* extends Ruga_Enum*/
+{
+    /** Key: Alpha-2 code */
+    const ALPHA_2 = 'A2';
+    
+    /** Key: Alpha-3 code */
+    const ALPHA_3 = 'A3';
+    
+    /** Key: Numeric code */
+    const NUMERIC = 'NUM';
+    
+    /** Key: Top Level Domain */
+    const TLD = 'TLD';
+    
+    /** Key: Currency Code */
+    const CURRENCY_CODE = 'CURRENCY_CODE';
+    const TELEPHONE_CODE = 'TEL_CODE';
+    const REGION = 'REGION';
+    const REGION_CODE = 'REGION_CODE';
+    const SUBREGION = 'SUBREGION';
+    const SUBREGION_CODE = 'SUBREGION_CODE';
+    const INTERMEDIATEREGION = 'INTERMEDIATEREGION';
+    const INTERMEDIATEREGION_CODE = 'INTERMEDIATEREGION_CODE';
+    const NAME_eng = 'NAME_eng';
+    const NAME_fra = 'NAME_fra';
+    const NAME_deu = 'NAME_deu';
+    
+    
+    /** Key: Postal country name */
+    const POST = 'POST';
+    
+    
+    const DEFAULT = self::ALPHA_3;
+    
+    
+    protected static $fullnameMap = [
+        self::ALPHA_2 => 'ISO 3166 Alpha-2',
+        self::ALPHA_3 => 'ISO 3166 Alpha-3',
+        self::NUMERIC => 'ISO 3166 Numerisch',
+        self::TLD => 'Top Level Domain',
+        self::CURRENCY_CODE => 'Währung',
+        self::TELEPHONE_CODE => 'Landesvorwahl',
+        self::REGION => 'Region',
+        self::REGION_CODE => 'Region Code',
+        self::SUBREGION => 'Unter-Region',
+        self::SUBREGION_CODE => 'Unter-Region Code',
+        self::INTERMEDIATEREGION => 'Intermediate-Region',
+        self::INTERMEDIATEREGION_CODE => 'Intermediate-Region Code',
+        self::NAME_eng => 'Englische Bezeichnung',
+        self::NAME_fra => 'Französische Bezeichnung',
+        self::NAME_deu => 'Deutsche Bezeichnung',
+        
+        self::POST => 'Landesbezeichung Postadresse',
+    ];
+    
+    
+}
+

classes/Components/I18n/Iso3166/Name.php

@@ -0,0 +1,32 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Iso3166;
+
+/**
+ * Names for the iso3166 list.
+ *
+ * @see      \Xentral\Components\I18n\Iso3166
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+abstract class Name/* extends Ruga_Enum */
+{
+    /** Englisch */
+    const ENG = 'NAME_eng';
+    /** Französisch */
+    const FRA = 'NAME_fra';
+    /** Deutsch */
+    const DEU = 'NAME_deu';
+    
+    
+    protected static $fullnameMap = [
+        self::ENG => 'Englische Bezeichnung',
+        self::FRA => 'Französische Bezeichnung',
+        self::DEU => 'Deutsche Bezeichnung',
+    ];
+}

classes/Components/I18n/Iso639.php

@@ -0,0 +1,73 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n;
+
+use Xentral\Components\I18n\Dataaccess\DataProvider;
+use Xentral\Components\I18n\Dataaccess\Exception\OutOfRangeException;
+
+/**
+ * Codes for the Representation of Names of Languages - ISO 639.
+ * Loads the data and holds the filtered (if desired) list.
+ *
+ * @see      https://www.iso.org/iso-639-language-codes.html
+ * @see      DataProvider
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+class Iso639 extends DataProvider
+{
+    /**
+     * {@inheritDoc}
+     * @see \Xentral\Components\I18n\Dataaccess\DataProvider::getOriginalData()
+     */
+    protected function getOriginalData(): array
+    {
+        return include(__DIR__ . '/data/Iso639data.php');
+    }
+    
+    
+    
+    /**
+     * Returns the field $desiredName from the record $id.
+     *
+     * @param mixed  $id
+     * @param string $desiredName
+     * @param null   $default
+     *
+     * @return string
+     */
+    public function find($id, $desiredName, $default = null): string
+    {
+        $id = strtolower($id);
+        try {
+            return $this->getString($id, $desiredName);
+        } catch (OutOfRangeException $e) {
+            try {
+                return (new \Xentral\Components\I18n\Iso639(
+                    (new \Xentral\Components\I18n\Iso639\Filter\All())
+                        ->then(new \Xentral\Components\I18n\Iso639\Filter\ChangeKey(\Xentral\Components\I18n\Iso639\Key::ALPHA_2))
+                ))->getString($id, $desiredName);
+            } catch (OutOfRangeException $e) {
+                try {
+                    $id = strtoupper($id);
+                    return (new \Xentral\Components\I18n\Iso639(
+                        (new \Xentral\Components\I18n\Iso639\Filter\All())
+                            ->then(new \Xentral\Components\I18n\Iso639\Filter\ChangeKey(\Xentral\Components\I18n\Iso639\Key::ONELETTER))
+                    ))->getString($id, $desiredName);
+                } catch (OutOfRangeException $e) {
+                    if ($default === null) {
+                        throw $e;
+                    } else {
+                        return $this->getString($default, $desiredName);
+                    }
+                }
+            }
+        }
+    }
+    
+}

classes/Components/I18n/Iso639/Filter/All.php

@@ -0,0 +1,32 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Iso639\Filter;
+
+use Xentral\Components\I18n\Dataaccess\DataFilter;
+use Xentral\Components\I18n\Dataaccess\DataFilterInterface;
+
+
+/**
+ * This filter returns all records from the data set (aka dummy filter).
+ *
+ * @see      \Xentral\Components\I18n\Dataaccess\DataFilter
+ * @see      \Xentral\Components\I18n\Dataaccess\DataFilterInterface
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+class All extends DataFilter implements DataFilterInterface
+{
+    /**
+     * {@inheritDoc}
+     * @see \Xentral\Components\I18n\Dataaccess\DataFilterInterface::selectItem()
+     */
+    function selectItem(&$key, &$val): bool
+    {
+        return true;
+    }
+}

classes/Components/I18n/Iso639/Filter/CentralEurope.php

@@ -0,0 +1,41 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Iso639\Filter;
+
+use Xentral\Components\I18n\Dataaccess\DataFilterInterface;
+use Xentral\Components\I18n\Iso639\Key;
+
+
+/**
+ * Applies a filter to only select central european countries.
+ *
+ * @see      Custom
+ * @see      \Xentral\Components\I18n\Dataaccess\DataFilter
+ * @see      \Xentral\Components\I18n\Dataaccess\DataFilterInterface
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+class CentralEurope extends Custom implements DataFilterInterface
+{
+    /**
+     * Countries in Europe.
+     *
+     * @var array
+     */
+    const CentralEurope_Languages = ['deu', 'fra', 'ita', 'roh', 'spa', 'por', 'eng'];
+    
+    
+    
+    /**
+     * Set predefined values.
+     */
+    public function __construct()
+    {
+        parent::__construct(static::CentralEurope_Languages, Key::ALPHA_3);
+    }
+}

classes/Components/I18n/Iso639/Filter/ChangeKey.php

@@ -0,0 +1,55 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Iso639\Filter;
+
+use Xentral\Components\I18n\Dataaccess\DataFilterInterface;
+use Xentral\Components\I18n\Dataaccess\DataFilter;
+
+
+/**
+ * This filter can be used to change the main key
+ * of the data set.
+ *
+ * @see      \Xentral\Components\I18n\Dataaccess\DataFilter
+ * @see      \Xentral\Components\I18n\Dataaccess\DataFilterInterface
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+class ChangeKey extends DataFilter implements DataFilterInterface
+{
+    /**
+     * New key to use for the data set.
+     *
+     * @var string
+     */
+    private $ChangeKey_key = null;
+    
+    
+    
+    /**
+     * Initialize filter and set the new key.
+     *
+     * @param mixed $key
+     */
+    public function __construct($key)
+    {
+        $this->ChangeKey_key = $key;
+    }
+    
+    
+    
+    /**
+     * {@inheritDoc}
+     * @see \Xentral\Components\I18n\Dataaccess\DataFilterInterface::selectItem()
+     */
+    protected function selectItem(&$key, &$val): bool
+    {
+        $key = $val[$this->ChangeKey_key] ?? null;
+        return true;
+    }
+}

classes/Components/I18n/Iso639/Filter/Custom.php

@@ -0,0 +1,63 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Iso639\Filter;
+
+use Xentral\Components\I18n\Dataaccess\DataFilter;
+use Xentral\Components\I18n\Dataaccess\DataFilterInterface;
+
+
+/**
+ * Apply a custom filter to the data set.
+ *
+ * @see      \Xentral\Components\I18n\Dataaccess\DataFilter
+ * @see      \Xentral\Components\I18n\Dataaccess\DataFilterInterface
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+class Custom extends DataFilter implements DataFilterInterface
+{
+    /**
+     * Array of wanted values.
+     *
+     * @var array
+     */
+    private $Custom_values = null;
+    
+    /**
+     * Key to check for the values in $this->Custom_values.
+     *
+     * @var string
+     */
+    private $Custom_key = null;
+    
+    
+    
+    /**
+     * Set values for filter.
+     *
+     * @param array $values
+     * @param mixed $key
+     */
+    public function __construct(array $values, $key)
+    {
+        $this->Custom_values = $values;
+        $this->Custom_key = $key;
+    }
+    
+    
+    
+    /**
+     * {@inheritDoc}
+     * @see \Xentral\Components\I18n\Dataaccess\DataFilterInterface::selectItem()
+     */
+    protected function selectItem(&$key, &$val): bool
+    {
+        $needle = $val[$this->Custom_key];
+        return in_array($needle, $this->Custom_values);
+    }
+}

classes/Components/I18n/Iso639/Key.php

@@ -0,0 +1,51 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Iso639;
+
+
+/**
+ * Keys for the iso639 list.
+ *
+ * @see      \Xentral\Components\I18n\Iso639
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+abstract class Key/* extends Ruga_Enum*/
+{
+    /** Key: Alpha-2 code */
+    const ALPHA_2 = '639-1';
+    const ISO639_1 = '639-1';
+    
+    /** Key: Alpha-3 code */
+    const ALPHA_3 = '639-2';
+    const ISO639_2 = '639-2';
+    
+    /** Key: Top Level Domain */
+    const ONELETTER = '1L';
+    
+    /** Key: Name */
+    const NAME_eng = 'NAME_eng';
+    const NAME_fra = 'NAME_fra';
+    const NAME_deu = 'NAME_deu';
+    
+    
+    const DEFAULT = self::ALPHA_3;
+    
+    
+    protected static $fullnameMap = [
+        self::ALPHA_2 => 'ISO 639 Alpha-2',
+        self::ALPHA_3 => 'ISO 639 Alpha-3',
+        self::ONELETTER => 'ISO 639 Alpha-1',
+        self::NAME_eng => 'Englische Bezeichnung',
+        self::NAME_fra => 'Französische Bezeichnung',
+        self::NAME_deu => 'Deutsche Bezeichnung',
+    ];
+    
+    
+}
+

classes/Components/I18n/Iso639/Name.php

@@ -0,0 +1,33 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n\Iso639;
+
+
+/**
+ * Names for the iso639 list.
+ *
+ * @see      \Xentral\Components\I18n\Iso639
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+abstract class Name/* extends Ruga_Enum */
+{
+    /** Englisch */
+    const ENG = 'NAME_eng';
+    /** Französisch */
+    const FRA = 'NAME_fra';
+    /** Deutsch */
+    const DEU = 'NAME_deu';
+    
+    
+    protected static $fullnameMap = [
+        self::ENG => 'Englische Bezeichnung',
+        self::FRA => 'Französische Bezeichnung',
+        self::DEU => 'Deutsche Bezeichnung',
+    ];
+}

classes/Components/I18n/Localization.php

@@ -0,0 +1,244 @@
+<?php
+/*
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n;
+
+use Locale;
+use Xentral\Components\Http\Request;
+use Xentral\Components\Http\Session\Session;
+use Xentral\Components\I18n\Exception\LanguageNotInitializedException;
+use Xentral\Components\I18n\Exception\UnsupportedLocaleStringException;
+
+/**
+ * Provides a central service for localization.
+ *
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+final class Localization implements LocalizationInterface
+{
+    private array $config;
+    
+    private ?Request $request;
+    
+    private ?Session $session;
+    
+    private array $usersettings = [];
+    
+    private array $language = [];
+    
+    private array $locale = [];
+    
+    
+    
+    public function __construct(?Request $request, ?Session $session, array $usersettings = [], array $config = [])
+    {
+        $this->request = $request;
+        $this->session = $session;
+        $this->usersettings = $usersettings;
+        $this->config = $config;
+        $this->process();
+    }
+    
+    
+    
+    public function process()
+    {
+        // Hardcoded defaults if config is not available
+        $localeDefault = $this->config[Localization::LOCALE_DEFAULT] ?? 'de_DE';
+        $localeAttrName = $this->config[Localization::LOCALE_ATTRIBUTE_NAME] ?? 'locale';
+        $langDefault = $this->config[Localization::LANGUAGE_DEFAULT] ?? 'deu';
+        $langAttrName = $this->config[Localization::LANGUAGE_ATTRIBUTE_NAME] ?? 'language';
+        
+        $segmentName = 'i18n';
+        
+        // Get the locale from the session, if available
+        if ($this->session && ($locale = $this->session->getValue($segmentName, $localeAttrName))) {
+        } else {
+            // Get locale from request, fallback to the user's browser preference
+            if ($this->request) {
+                $locale = $this->request->attributes->get(
+                    $localeAttrName,
+                    Locale::acceptFromHttp(
+                        $this->request->getHeader('Accept-Language', $localeDefault)
+                    ) ?? $localeDefault
+                );
+            } else {
+                $locale = Locale::acceptFromHttp($_SERVER['HTTP_ACCEPT_LANGUAGE'] ?? $localeDefault);
+            }
+        }
+        // Get locale from user
+        // This overrides all previous attempts to find a locale
+        if (array_key_exists('locale', $this->usersettings)) {
+            $locale = $this->usersettings['locale'];
+        }
+        // Get locale from query string
+        // This overrides all previous attempts to find a locale
+        if ($this->request) {
+            $locale = $this->request->getParam($localeAttrName, $locale ?? $localeDefault);
+        } else {
+            $locale = $_GET[$localeAttrName] ?? $locale ?? $localeDefault;
+        }
+        
+        
+        // Get the language from the session, if available
+        if ($this->session && ($language = $this->session->getValue($segmentName, $langAttrName))) {
+        } else {
+            // Get language from request, fallback to the current locale
+            if ($this->request) {
+                $language = $this->request->attributes->get($langAttrName, Locale::getPrimaryLanguage($locale));
+            } else {
+                $language = Locale::getPrimaryLanguage($locale);
+            }
+        }
+        // Get language from user
+        // This overrides all previous attempts to find a language
+        if (array_key_exists('language', $this->usersettings)) {
+            $language = $this->usersettings['language'];
+        }
+        // Get language from query string
+        // This overrides all previous attempts to find a language
+        if ($this->request) {
+            $language = $this->request->getParam($langAttrName, $language ?? $langDefault);
+        } else {
+            $language = $language ?? $langDefault;
+        }
+        
+        // Check language against the data from Iso639 (and normalize to 3-letter-code)
+        $language = (new Iso639())->find($language, Iso639\Key::DEFAULT, $langDefault);
+        
+        
+        // Store the locale and language to the LocalizationInterface
+        $this->setLanguage($language);
+        $this->setLocale($locale);
+        
+        // Store the locale and language to the session
+        if ($this->session) {
+            $this->session->setValue($segmentName, $localeAttrName, $locale);
+            $this->session->setValue($segmentName, $langAttrName, $language);
+        }
+        
+        // Store the locale and language as a request attribute
+        if ($this->request) {
+            $this->request->attributes->set($localeAttrName, $locale);
+            $this->request->attributes->set($langAttrName, $language);
+        }
+        
+        // Set the default locale
+        Locale::setDefault($locale);
+//        error_log(self::class . ": {$locale}");
+    }
+    
+    
+    
+    /**
+     * Set the language.
+     *
+     * @param string $language
+     */
+    public function setLanguage(string $language)
+    {
+        $this->language[Iso639\Key::DEFAULT] = (new \Xentral\Components\I18n\Iso639())->find(
+            $language,
+            Iso639\Key::DEFAULT
+        );
+    }
+    
+    
+    
+    /**
+     * Return the language string as defined by $key.
+     *
+     * @param string|null $key A constant from Iso639\Key
+     *
+     * @return string
+     */
+    public function getLanguage(string $key = null): string
+    {
+        if (!$key) {
+            $key = Iso639\Key::DEFAULT;
+        }
+        if (!($this->language[$key] ?? null)) {
+            if (!($this->language[Iso639\Key::DEFAULT] ?? null)) {
+                throw new LanguageNotInitializedException("Language is not set for key '" . Iso639\Key::DEFAULT . "'");
+            }
+            $this->language[$key] = (new \Xentral\Components\I18n\Iso639())->find(
+                $this->language[Iso639\Key::DEFAULT],
+                $key
+            );
+        }
+        return $this->language[$key];
+    }
+    
+    
+    
+    /**
+     * Set the locale.
+     *
+     * @param string $locale
+     */
+    public function setLocale(string $locale)
+    {
+        $parsedLocale = Locale::parseLocale($locale);
+        $locale = Locale::composeLocale([
+                                            'language' => $parsedLocale['language'],
+                                            'region' => $parsedLocale['region'],
+                                        ]);
+        
+        if(!$locale) throw new UnsupportedLocaleStringException("The given locale string '{$locale}' is not supported");
+        
+        $this->locale[Iso3166\Key::DEFAULT] = $locale;
+    }
+    
+    
+    
+    /**
+     * Return the locale string as defined by $key.
+     *
+     * @param string|null $key A constant from Iso3166\Key
+     *
+     * @return string
+     */
+    public function getLocale(string $key = null): string
+    {
+        return $this->locale[Iso3166\Key::DEFAULT];
+    }
+    
+    
+    
+    /**
+     * Return a new localization object using the given adresse array as source for language and region.
+     *
+     * @param array $adresse
+     *
+     * @return $this
+     */
+    public function withAdresse(array $adresse): self
+    {
+        $localization = clone $this;
+        
+        // Find language from address array or keep current language
+        if (!$lang = Bootstrap::findLanguage($adresse['sprache'])) {
+            $lang = Bootstrap::findLanguage($this->getLanguage());
+        }
+        if ($lang) {
+            $localization->setLanguage($lang[Iso639\Key::ALPHA_3]);
+        }
+        
+        // Find region from address or keep current region
+        if (!$region = Bootstrap::findRegion($adresse['land'])) {
+            $parsedLocale = Locale::parseLocale($this->getLocale());
+            $region = Bootstrap::findRegion($parsedLocale['region']);
+        }
+        if ($lang && $region) {
+            $localization->setLocale("{$lang[Iso639\Key::ALPHA_2]}_{$region[Iso3166\Key::ALPHA_2]}");
+        }
+        
+        return $localization;
+    }
+    
+}

classes/Components/I18n/LocalizationInterface.php

@@ -0,0 +1,62 @@
+<?php
+/*
+ * SPDX-FileCopyrightText: 2023 Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+declare(strict_types=1);
+
+namespace Xentral\Components\I18n;
+
+/**
+ * Interface LocalizationInterface
+ *
+ * @author   Roland Rusch, easy-smart solution GmbH <roland.rusch@easy-smart.ch>
+ */
+interface LocalizationInterface
+{
+    const LOCALE_DEFAULT = 'locale_default';
+    const LOCALE_ATTRIBUTE_NAME = 'locale_attr_name';
+    const LANGUAGE_DEFAULT = 'language_default';
+    const LANGUAGE_ATTRIBUTE_NAME = 'language_attr_name';
+    
+    
+    
+    /**
+     * Set the language.
+     *
+     * @param string $language
+     */
+    public function setLanguage(string $language);
+    
+    
+    
+    /**
+     * Return the language string as defined by $key.
+     *
+     * @param string|null $key A constant from Iso639\Key
+     *
+     * @return string
+     */
+    public function getLanguage(string $key = null): string;
+    
+    
+    
+    /**
+     * Set the locale.
+     *
+     * @param string $locale
+     */
+    public function setLocale(string $locale);
+    
+    
+    
+    /**
+     * Return the locale string as defined by $key.
+     *
+     * @param string|null $key A constant from Iso3166\Key
+     *
+     * @return string
+     */
+    public function getLocale(string $key = null): string;
+}

classes/Components/I18n/data/Iso639data.php

@@ -0,0 +1,159 @@
+<?php
+/*
+ * Data extracted from https://www.iso.org/iso-639-language-codes.html
+ */
+return [
+    
+    'aar' => [
+        '639-2' => 'aar',
+        '639-1' => 'aa',
+        'NAME_eng' => 'Afar',
+        'NAME_fra' => 'afar',
+        'NAME_deu' => 'Danakil-Sprache',
+    ],
+    'abk' => [
+        '639-2' => 'abk',
+        '639-1' => 'ab',
+        'NAME_eng' => 'Abkhazian',
+        'NAME_fra' => 'abkhaze',
+        'NAME_deu' => 'Abchasisch',
+    ],
+    'ace' => [
+        '639-2' => 'ace',
+        '639-1' => null,
+        'NAME_eng' => 'Achinese',
+        'NAME_fra' => 'aceh',
+        'NAME_deu' => 'Aceh-Sprache',
+    ],
+    'ach' => [
+        '639-2' => 'ach',
+        '639-1' => null,
+        'NAME_eng' => 'Acoli',
+        'NAME_fra' => 'acoli',
+        'NAME_deu' => 'Acholi-Sprache',
+    ],
+    'ada' => [
+        '639-2' => 'ada',
+        '639-1' => null,
+        'NAME_eng' => 'Adangme',
+        'NAME_fra' => 'adangme',
+        'NAME_deu' => 'Adangme-Sprache',
+    ],
+    'ady' => [
+        '639-2' => 'ady',
+        '639-1' => null,
+        'NAME_eng' => 'Adyghe',
+        'NAME_fra' => 'adyghé',
+        'NAME_deu' => 'Adygisch',
+    ],
+    'afa' => [
+        '639-2' => 'afa',
+        '639-1' => null,
+        'NAME_eng' => 'Afro-Asiatic languages',
+        'NAME_fra' => 'afro-asiatiques, langues',
+        'NAME_deu' => 'Hamitosemitische Sprachen (Andere)',
+    ],
+    'afh' => [
+        '639-2' => 'afh',
+        '639-1' => null,
+        'NAME_eng' => 'Afrihili',
+        'NAME_fra' => 'afrihili',
+        'NAME_deu' => 'Afrihili',
+    ],
+    'afr' => [
+        '639-2' => 'afr',
+        '639-1' => 'af',
+        'NAME_eng' => 'Afrikaans',
+        'NAME_fra' => 'afrikaans',
+        'NAME_deu' => 'Afrikaans',
+    ],
+    'ain' => [
+        '639-2' => 'ain',
+        '639-1' => null,
+        'NAME_eng' => 'Ainu',
+        'NAME_fra' => 'aïnou',
+        'NAME_deu' => 'Ainu-Sprache',
+    ],
+    'aka' => [
+        '639-2' => 'aka',
+        '639-1' => 'ak',
+        'NAME_eng' => 'Akan',
+        'NAME_fra' => 'akan',
+        'NAME_deu' => 'Akan-Sprache',
+    ],
+    'akk' => [
+        '639-2' => 'akk',
+        '639-1' => null,
+        'NAME_eng' => 'Akkadian',
+        'NAME_fra' => 'akkadien',
+        'NAME_deu' => 'Akkadisch',
+    ],
+    'sqi' => [
+        '639-2' => 'sqi',
+        '639-1' => 'sq',
+        'NAME_eng' => 'Albanian',
+        'NAME_fra' => 'albanais',
+        'NAME_deu' => 'Albanisch',
+        '639-2-B' => 'alb',
+    ],
+    
+    'deu' => [
+        '639-2' => 'deu',
+        '639-1' => 'de',
+        'NAME_eng' => 'German',
+        'NAME_fra' => 'allemand',
+        'NAME_deu' => 'Deutsch',
+        '639-2-B' => 'ger',
+        '1L' => 'D',
+    ],
+    'eng' => [
+        '639-2' => 'eng',
+        '639-1' => 'en',
+        'NAME_eng' => 'English',
+        'NAME_fra' => 'anglais',
+        'NAME_deu' => 'Englisch',
+        '1L' => 'E',
+    ],
+    'fra' => [
+        '639-2' => 'fra',
+        '639-1' => 'fr',
+        'NAME_eng' => 'French',
+        'NAME_fra' => 'français',
+        'NAME_deu' => 'Französisch',
+        '639-2-B' => 'fre',
+        '1L' => 'F',
+    ],
+    'ita' => [
+        '639-2' => 'ita',
+        '639-1' => 'it',
+        'NAME_eng' => 'Italian',
+        'NAME_fra' => 'italien',
+        'NAME_deu' => 'Italienisch',
+        '1L' => 'I',
+    ],
+    'spa' => [
+        '639-2' => 'spa',
+        '639-1' => 'es',
+        'NAME_eng' => 'Spanish',
+        'NAME_fra' => 'espagnol',
+        'NAME_deu' => 'Spanisch',
+    ],
+    'por' => [
+        '639-2' => 'por',
+        '639-1' => 'pt',
+        'NAME_eng' => 'Portuguese',
+        'NAME_fra' => 'portugais',
+        'NAME_deu' => 'Portugiesisch',
+    ],
+    'roh' => [
+        '639-2' => 'roh',
+        '639-1' => 'rm',
+        'NAME_eng' => 'Romansh',
+        'NAME_fra' => 'romanche',
+        'NAME_deu' => 'Rätoromanisch',
+    ],
+    'dut' => ['639-2' => 'dut', '639-1' => 'nl', 'NAME_eng' => 'Dutch', 'NAME_fra' => 'néerlandais', 'NAME_deu' => 'Niederländisch', 'NAME_deu_alt' => 'Holländisch'],
+    'swe' => ['639-2' => 'swe', '639-1' => 'sv', 'NAME_eng' => 'Swedish', 'NAME_fra' => 'suédois', 'NAME_deu' => 'Schwedisch'],
+    'dan' => ['639-2' => 'dan', '639-1' => 'da', 'NAME_eng' => 'Danish', 'NAME_fra' => 'danois', 'NAME_deu' => 'Dänisch'],
+    'nor' => ['639-2' => 'nor', '639-1' => 'no', 'NAME_eng' => 'Norwegian', 'NAME_fra' => 'norvégien', 'NAME_deu' => 'Norwegisch'],
+];

www/pages/content/welcome_settings.tpl

@@ -96,6 +96,10 @@
                   <tr>
                     <td>{|Sprache|}:</td>
                     <td><select name="sprachebevorzugen" id="sprachebevorzugen">[SPRACHEBEVORZUGEN]</select></td>
+                  </tr>
+					<tr>
+						<td>{|Sprache und Region|}:</td>
+						<td><input type="text" name="locale" id="locale" value="[LOCALE]" size="40" disabled="disabled"></td>
 					</tr>
 					<tr>
                     <td>{|Eigene Kalenderfarbe|}:</td>

www/pages/welcome.php

@@ -1712,6 +1712,13 @@ $this->app->Tpl->Add('TODOFORUSER',"<tr><td width=\"90%\">".$tmp[$i]['aufgabe'].
     $this->app->Tpl->Set('DEFAULTCOLOR', $settings['defaultcolor']);
     $this->app->Tpl->Set('SPRACHEBEVORZUGEN', $this->languageSelectOptions($settings['sprachebevorzugen']));
     
+    /** @var \Xentral\Components\I18n\Localization $localization */
+    if($localization=$this->app->Container->get('Localization')) {
+        $this->app->Tpl->Set('LOCALE', $localization->getLocale());
+    } else {
+        $this->app->Tpl->Set('LOCALE', 'Fehler!');
+    }
+
     if($settings['chat_popup']){
       $this->app->Tpl->Set('CHAT_POPUP', ' checked="checked" ');
     }

www/widgets/templates/_gen/adresse.tpl

@@ -149,6 +149,7 @@ $(document).ready(function(){
         <tr valign="top"><td>{|Liefersperre Grund|}:</td><td>[LIEFERSPERREGRUND][MSGLIEFERSPERREGRUND]</td></tr>
         <tr><td colspan="2"><br></td></tr>	
         <tr><td>{|Sprache f&uuml;r Belege|}:</td><td>[SPRACHE][MSGSPRACHE]</td></tr>
+        <tr><td>{|Sprache und Region|}:</td><td>[LOCALE][MSGLOCALE]</td></tr>
 
         <tr><td>{|Kundenfreigabe|}:</td><td>[KUNDENFREIGABE][MSGKUNDENFREIGABE]            </td></tr>
         <tr><td colspan="2"><br></td></tr>	

www/widgets/widget.adresse.php

@@ -1,4 +1,7 @@
 <?php
+
+use Xentral\Components\Database\Database;
+
 include ("_gen/widget.gen.adresse.php");
 
 class WidgetAdresse extends WidgetGenAdresse 
@@ -285,6 +288,19 @@ class WidgetAdresse extends WidgetGenAdresse
     $field->AddOptionsSimpleArray($sprachenOptions);
     $this->form->NewField($field);
     
+    /** @var \Xentral\Components\I18n\Localization $localization */
+    $localization=$this->app->Container->get('Localization');
+    /** @var Database $db */
+    $db = $this->app->Container->get('Database');
+    $adresse = $db->fetchRow(
+          $db->select()->cols(['*'])->from('adresse')->where('id=:id'),
+          ['id' => $id]
+    );
+    $localization=$localization->withAdresse($adresse);
+    $field = new HTMLInput("locale","text",$localization->getLocale(), size: '10', disabled: 'disabled');
+    $this->form->NewField($field);
+    
+    
     $field = new HTMLInput("vorname","hidden","");
     $this->form->NewField($field);