App Customise Guess the picture My language is not support (Tamil)

Hi Developers,
I was buy the source code from source code selling website , that is the guess picture realtime firebase database android app.

The code seller is telling that the product is support all languages, but after i reskin that product is not support my language (Tamil). iam contacting seller

in english is that app is working well, but my language letter is combine two letter to one letter (like k+a=ka , க + ர =கா) but that app split that letter into two.

Please fix that problem , I can reskin the app. I want only my language fixing.