protected function _appendLangFile($aLangFiles, $sFullPath, $sFilePattern = "lang")
    {
        $aFiles = glob($sFullPath . "/*_{$sFilePattern}.php");
        if (is_array($aFiles) && count($aFiles)) {
            foreach ($aFiles as $sFile) {
                if (!strpos($sFile, 'cust_lang.php')) {
                    $aLangFiles[] = $sFile;
                }
            }
        }

        return $aLangFiles;
    }