code: public function getFallbackLanguage()
      {
          if ($this->isTranslated()) {
              foreach ($this->arrData['languages'] as $strLangCode => $arrData) {
                  if ($arrData['isfallback']) {
                      return $strLangCode;
                  }
              }
          }
  
          return null;
      }
docs: {@inheritdoc}