Requires basic PHP knowledge.
Integration of first group is easy as long as xml_print_output is used. If you are not sure does specific mod is using it ask mod author or just try to integrate and check results.
So to integrate it all what you have to do is find place (in some plugin or php file) where mod generates URL for Ajax request and add at the end of this request:
or if there is no any parameter in URL:Code:.'&language='.$_REQUEST['language']
Code:.'?language='.$_REQUEST['language']