Inheritance: extends TextContainer
 /**
  * @param string|TranslationContainer $str
  * @param string[] $params
  * @return string
  */
 public static function translateString($str, array $params = null)
 {
     if ($str instanceof TranslationContainer) {
         $params = $str->getParameters();
         $str = $str->getText();
     }
     return Server::getInstance()->getLanguage()->translateString($str, $params);
 }