public function createUrl($params)
 {
     if (isset($params['lang_id'])) {
         $lang = Language::findOne($params['lang_id']);
         if ($lang === null) {
             $lang = Language::getDefaultLang();
         }
         unset($params['lang_id']);
     } else {
         $lang = Language::getCurrent();
     }
     $url = parent::createUrl($params);
     if ($url == '/') {
         return '/' . $lang->url;
     } else {
         return '/' . $lang->url . $url;
     }
 }