Path::addLangId

static function addLangId(string $path, string $langId, ?array $langs = null): string
{
	$pathTemp = self::removeLangId($path, $langs);

	$arr = explode('/', $pathTemp);
	if (in_array('lang', $arr))
	{
		$arr1 = array();
		foreach($arr as $d)
		{
			$arr1[] = $d;
			if ($d === 'lang')
			{
				$arr1[] = $langId;
			}
		}
		$path = implode('/', $arr1);
	}

	return $path;
}