Force loading the default administrator language

administrator/components/com_languages/controllers/installed.php

@@ -43,4 +43,31 @@ public function setDefault()
 		$clientId = $model->getState('filter.client_id');
 		$this->setredirect('index.php?option=com_languages&view=installed&client=' . $clientId, $msg, $type);
 	}
+
+	/**
+	 * Task to force loading the default administrator language.
+	 *
+	 * @return  void
+	 */
+	public function forceAdminLanguage()
+	{
+		// Check for request forgeries.
+		JSession::checkToken() or jexit(JText::_('JInvalid_Token'));
+
+		$model = $this->getModel('installed');
+
+		if ($model->force())
+		{
+			$msg = JText::_('COM_LANGUAGES_MSG_DEFAULT_LANGUAGE_FORCED');
+			$type = 'message';
+		}
+		else
+		{
+			$msg = $this->getError();
+			$type = 'error';
+		}
+
+		$clientId = $model->getState('filter.client_id');
+		$this->setredirect('index.php?option=com_languages&view=installed&client=' . $clientId, $msg, $type);
+	}
 }

administrator/components/com_languages/models/installed.php

@@ -414,4 +414,30 @@ protected function compareLanguages($lang1, $lang2)
 	{
 		return strcmp($lang1->name, $lang2->name);
 	}
+
+	/**
+	 * Method to force loading the default administrator language.
+	 *
+	 * @return  boolean
+	 *
+	 * @since   3.5
+	 */
+	public function force()
+	{
+		$language = JComponentHelper::getParams('com_languages')->get('administrator','en-GB');
+		$client = $this->getClient();
+
+		if ($client->name == 'administrator')
+		{
+			JFactory::getApplication()->setUserState('application.lang', $language);
+		}
+		else
+		{
+			$this->setError(JText::_('COM_LANGUAGES_ERR_DEFAULT_LANGUAGE_NOT_FORCED'));
+
+			return false;
+		}
+
+		return true;
+	}
 }

administrator/components/com_languages/views/installed/view.html.php

@@ -94,6 +94,13 @@ protected function addToolbar()
 			$bar->appendButton('Link', 'upload', 'COM_LANGUAGES_INSTALL', 'index.php?option=com_installer&view=languages');
 			JToolbarHelper::divider();
 
+			// Force administrator language
+			if ($this->state->get('filter.client_id', 0) == 1)
+			{
+				JToolbarHelper::custom('installed.forceadminlanguage', 'refresh', 'refresh', 'COM_LANGUAGES_FORCE_ADMIN', false);
+				JToolbarHelper::divider();
+			}
+
 			JToolbarHelper::preferences('com_languages');
 			JToolbarHelper::divider();
 		}

administrator/language/en-GB/en-GB.com_languages.ini

@@ -9,11 +9,13 @@ COM_LANGUAGES_ERR_DELETE="Select a language to delete"
 COM_LANGUAGES_ERR_NO_LANGUAGE_SELECTED="No language selected."
 COM_LANGUAGES_ERROR_LANG_TAG="<br />The Language Tag should contain 2 or 3 lowercase letters corresponding to the ISO language, a dash and 2 uppercase letters corresponding to the ISO country code. <br />This should be the exact prefix used for the language installed or to be installed. Example: en-GB, srp-ME."
 COM_LANGUAGES_ERR_PUBLISH="Select a language to publish."
+COM_LANGUAGES_ERR_DEFAULT_LANGUAGE_NOT_FORCED="Could not force loading the default Administrator Language."
 COM_LANGUAGES_FIELD_DESCRIPTION_DESC="Enter a description for the language."
 COM_LANGUAGES_FIELD_IMAGE_DESC="Prefix of the image file for this language when using the &quot;Use image flags&quot; Language Switcher basic option. Example: if 'en' is chosen, then the image will be en.gif. Images and CSS for this module are in media/mod_languages/."
 COM_LANGUAGES_FIELD_IMAGE_LABEL="Image Prefix"
 COM_LANGUAGES_FIELD_LANG_TAG_DESC="Enter the language tag – example: en-GB for English (UK). This should be the exact prefix used for the language installed or to be installed."
 COM_LANGUAGES_FIELD_LANG_TAG_LABEL="Language Tag"
+COM_LANGUAGES_FORCE_ADMIN="Force Administrator Language"
 COM_LANGUAGES_INSTALL="Install Language"
 COM_LANGUAGES_OVERRIDE_ERROR_RESERVED_WORDS="YES, NO, NULL, FALSE, ON, OFF, NONE, TRUE are reserved words and can't be used as language constants."
 COM_LANGUAGES_OVERRIDE_FIELD_BOTH_LABEL="For both locations"
@@ -53,6 +55,7 @@ COM_LANGUAGES_HEADING_LANGUAGE="Language"
 COM_LANGUAGES_HEADING_TITLE_NATIVE="Native Title"
 COM_LANGUAGES_HOMEPAGE="Home"
 COM_LANGUAGES_MSG_DEFAULT_LANGUAGE_SAVED="Default Language Saved. This does not affect users that have chosen a specific language on their profile or on the login page.<br /><strong class="_QQ_"red"_QQ_">Warning!</strong> When using the multilingual functionality (ie when the plugin System - Languagefilter is enabled) the Site Default Language has to also be a published Content language."
+COM_LANGUAGES_MSG_DEFAULT_LANGUAGE_FORCED="The default Administrator Language was successfully loaded."
 COM_LANGUAGES_MULTILANGSTATUS_CONTACTS_ERROR="Some of the contacts linked to the user <strong>%s</strong> are incorrect."
 COM_LANGUAGES_MULTILANGSTATUS_CONTACTS_ERROR_TIP="Warning! A user/author should have only one contact to which is assigned language 'All' OR one contact for each published Content Language."
 COM_LANGUAGES_MULTILANGSTATUS_CONTENT_LANGUAGE_PUBLISHED="Published Content Languages"