Backend\Core\Language\Language::getWorkingLanguage PHP Method

    public static function getWorkingLanguage()
    {
        return self::$currentWorkingLanguage;
    }

 /**
  * Execute the action
  * We will build the classname, require the class and call the execute method.
  */
 public function execute()
 {
     $this->loadConfig();
     // is the requested action available? If not we redirect to the error page.
     if (!$this->config->isActionAvailable($this->action)) {
         // build the url
         $errorUrl = '/' . NAMED_APPLICATION . '/' . $this->get('request')->getLocale() . '/error?type=action-not-allowed';
         // redirect to the error page
         return $this->redirect($errorUrl, 307);
     }
     // build action-class
     $actionClass = 'Backend\\Modules\\' . $this->getModule() . '\\Actions\\' . $this->getAction();
     if ($this->getModule() == 'Core') {
         $actionClass = 'Backend\\Core\\Actions\\' . $this->getAction();
     }
     if (!class_exists($actionClass)) {
         throw new Exception('The class ' . $actionClass . ' could not be found.');
     }
     // get working languages
     $languages = BackendLanguage::getWorkingLanguages();
     $workingLanguages = array();
     // loop languages and build an array that we can assign
     foreach ($languages as $abbreviation => $label) {
         $workingLanguages[] = array('abbr' => $abbreviation, 'label' => $label, 'selected' => $abbreviation == BackendLanguage::getWorkingLanguage());
     }
     // assign the languages
     $this->tpl->assign('workingLanguages', $workingLanguages);
     // create action-object
     /** @var $object BackendBaseAction */
     $object = new $actionClass($this->getKernel());
     $this->getContainer()->get('logger')->info("Executing backend action '{$object->getAction()}' for module '{$object->getModule()}'.");
     $object->execute();
     return $object->getContent();
 }