public function convertLangCode($langCode = null, $output = null) {
		$result = '';
		if (empty($langCode) || empty($output)) {
			return $result;
		}

		$cachePath = 'lang_code_info_' . md5(serialize(func_get_args()));
		$cached = Cache::read($cachePath, CAKE_BASIC_FUNC_CACHE_KEY_LANG_CODE);
		if (!empty($cached)) {
			return $cached;
		}

		$langCode = mb_strtolower($langCode);
		$this->options->setOutput($output);
		$result = (string)$this->converter->filter($langCode);
		Cache::write($cachePath, $result, CAKE_BASIC_FUNC_CACHE_KEY_LANG_CODE);

		return $result;
	}