@Mian Shahid Thank you for the response, I want to add one more language in font selection drop down so if a user post any thread he/she can post in hindi also. Is the way you suggested will do this task?
As I mentioned earlier, this may not the best way to do that, but working fine, you can check to add a diff. lang. font then try to post something, if work fine then carry on otherwise, revert all edits.
tbh. this is something that is to be done at the user side. xenforo has full support for hindi and any other language which is supported by unicode(?). you do not add fonts to add support for languages. they are supported out of the box. user just has to type in hindi. using a software keyboard on smartphones or using a virtual keyboard on computers.
If I understand well, @rakeshmali wants to users can choose hindi fontin font selection dropdown while posting a message. As they can write in English and Hindi too in the same message...