private function _getLanguageList()
    {
        $dirlist = CommonFunctions::gdc(PSI_APP_ROOT.'/language/');
        sort($dirlist);
        foreach ($dirlist as $file) {
            $lang_ext = strtolower(substr($file, strlen($file) - 4));
            $lang_name = strtolower(substr($file, 0, strlen($file) - 4));
            if ($lang_ext == ".xml") {
                array_push($this->_languages, $lang_name);
            }
        }
    }