[opensourcelover]

I would like to use any one of the following APIs for transliteration –

1. http://quillpad.com/free_widget.html
or
2. http://code.google.com/apis/language/transliterate/v1/getting_started.html

What files do I need to modify? Please help me get started. Thank you!!

[Paul Wong-Gibbs]

Did you search Google for an existing WordPress plugin? https://wordpress.org/extend/plugins/google-transliteration/ is one I found after a quick search. You could use that as a starting point for figuring out how to extend support to wherever you want in BuddyPress.

[opensourcelover]

It breaks the buddypress links like /groups and /forums