public function resetLanguageCache()
    {
        $aFiles = glob($this->getCacheFilePath(null, true) . '*');
        if (is_array($aFiles)) {
            // delete all language cache files
            $sPattern = $this->_sLanguageCachePattern;
            $aFiles = preg_grep($sPattern, $aFiles);
            foreach ($aFiles as $sFile) {
                @unlink($sFile);
            }
        }
    }