protected function LoadLangFiles($sLanguage = null)
 {
     if (!$sLanguage) {
         $sLanguage = $this->sCurrentLang;
     }
     parent::LoadLangFiles($this->sDefaultLang);
     if ($this->sDefaultLang != $sLanguage) {
         $aMsgDefault = $this->aLangMsg;
         parent::LoadLangFiles($sLanguage);
         $this->aLangMsg = array_merge($aMsgDefault, $this->aLangMsg);
     }
 }