Piwik\Plugins\LanguagesManager\LanguagesManager::getLanguageCodeForCurrentUser PHP Method

    public static function getLanguageCodeForCurrentUser()
    {
        $languageCode = self::getLanguageFromPreferences();
        if (!API::getInstance()->isLanguageAvailable($languageCode)) {
            $languageCode = Common::extractLanguageCodeFromBrowserLanguage(Common::getBrowserLanguage(), API::getInstance()->getAvailableLanguages());
        }
        if (!API::getInstance()->isLanguageAvailable($languageCode)) {
            $languageCode = Translate::getLanguageDefault();
        }
        return $languageCode;
    }

 public function index()
 {
     Piwik::checkUserIsNotAnonymous();
     $view = new View('@MobileMessaging/index');
     $view->isSuperUser = Piwik::hasUserSuperUserAccess();
     $mobileMessagingAPI = API::getInstance();
     $view->delegatedManagement = $mobileMessagingAPI->getDelegatedManagement();
     $view->credentialSupplied = $mobileMessagingAPI->areSMSAPICredentialProvided();
     $view->accountManagedByCurrentUser = $view->isSuperUser || $view->delegatedManagement;
     $view->strHelpAddPhone = Piwik::translate('MobileMessaging_Settings_PhoneNumbers_HelpAdd', array(Piwik::translate('General_Settings'), Piwik::translate('MobileMessaging_SettingsMenu')));
     if ($view->credentialSupplied && $view->accountManagedByCurrentUser) {
         $view->provider = $mobileMessagingAPI->getSMSProvider();
         $view->creditLeft = $mobileMessagingAPI->getCreditLeft();
     }
     $view->smsProviders = SMSProvider::$availableSMSProviders;
     // construct the list of countries from the lang files
     $countries = array();
     foreach (Common::getCountriesList() as $countryCode => $continentCode) {
         if (isset(CountryCallingCodes::$countryCallingCodes[$countryCode])) {
             $countries[$countryCode] = array('countryName' => \Piwik\Plugins\UserCountry\countryTranslate($countryCode), 'countryCallingCode' => CountryCallingCodes::$countryCallingCodes[$countryCode]);
         }
     }
     $view->countries = $countries;
     $view->defaultCountry = Common::getCountry(LanguagesManager::getLanguageCodeForCurrentUser(), true, IP::getIpFromHeader());
     $view->phoneNumbers = $mobileMessagingAPI->getPhoneNumbers();
     $this->setBasicVariablesView($view);
     return $view->render();
 }