Function _queryLang

Get the current site language code by converting dash (URL-friendly) to underscore (db-friendly)

Package: PHPLucidFrame\Core
Copyright: Copyright (c), PHPLucidFrame.
License: MIT License This source file is subject to the MIT license that is bundled with this source code in the file LICENSE
Author: Sithu sithu@phplucidframe.com
Located at helpers/utility_helper.php

Parameters summary
`string`	`$lang = null`	The language code (optional - if not provided, the current language code will be used)

Return value summary
`string`	The language code