private function install_lang($id_lang, $authorizations = array(), $activate = true)
 {
     LangsManager::install($id_theme, $authorizations, $activate);
     $error = LangsManager::get_error();
     if ($error !== null) {
         $this->view->put('MSG', MessageHelper::display($error, MessageHelper::NOTICE, 10));
     } else {
         $this->view->put('MSG', MessageHelper::display(LangLoader::get_message('process.success', 'status-messages-common'), MessageHelper::SUCCESS, 10));
     }
 }