Default Adding Languages to S-Voice

Hello,

I want to know how can I add additional languages to S-Voice. I have SGH-I337 which does not have English-Indian in its S-Voice however this language is available in international/asian version of S4/S-Voice. Can someone please help / guide me on getting this language on SGH-I337 by hook or crook.

please any reply pointers are highly appreciated.

Sincerely,