[*] MO : Correct Google sitemap generation if id_lang = 1 doesn't exist

In _getXXXXXLink() $lang is an array. The id_lang is $lang['id_lang'].

Nothing is generated if id_lang = 1 doesn't exist (the array is convert in the Sql string by '1').
Update gsitemap.php

Fixed some selects with `id_lang` = '.(int)$lang['id_lang'].' instead of `id_lang` = '.(int)$lang.'
Merge branch 'patch-1' of https://github.com/agusjar/PrestaShop-modules into agusjar-patch-1
// Merge fixed