Path::isLangDir

static function isLangDir(string $path, bool $additionalCheck = false): bool
{
	$modifier = TranslateConfig::isUtfMode() ? 'u' : '';
	if (preg_match("#/lang/([^/]*?)(/|$)#".$modifier, $path, $match))
	{
		foreach (TranslateIGNORE_LANG_NAMES as $check)
		{
			if (mb_strpos($path, '/lang/'.$match[1].'/'.$check.'/') !== false)
			{
				return false;
			}
		}
		if ($additionalCheck)
		{
			$arr = explode(self::DIRECTORY_SEPARATOR, $path);
			$langKey = array_search('lang', $arr) + 1;

			return array_key_exists($langKey, $arr) && $arr[$langKey] <> '';
		}

		return true;
	}

	return false;
}