issue: Multilingual FAQ Category w/ Parent

This addresses issue 4810 where having more than one language installed and
trying to add a new FAQ Category with a Parent Category relation fails to
add the Parent Category relation. This is due to multiple Select2 fields;
the POST data includes only the last Select2 field's value instead of the
one in the tab you're currently on. This adds a script to set all Select2
fields in all the available languages to the same value so the POST will
always contain the appropriate Parent ID no matter what language tab you’re
on.