I am sorry to disappoint you but this is definitely not Gantry. I can prove this very easily to you.
Check the following site:
bluemountaincoffeejamaica.com
It is developed using Kirigami template and if you check source code of the web site when you change the language of the site, you will see that
<html xmlns="http://www.w3.org/1999/xhtml" ....
line changes accordingly
And especially since you say the following in that thread on anything-digital web site
i assigned the default template : Beez5
but the problem is the same ...
Please work this out with sh404sef support