12-20-2013 07:52 AM
Welcome to BlackBerry Support Forums
What is your device OS version ?
First try this .. Connect your Device to your PC and run BlackBerry Desktop Software again , Open BlackBerry Desktop Software ( 7.1 ) > Select Applications. > In the Language and Input Support section, Scroll down ,Are you able to view the desired language in that list ? If you're able to view it then select the language to be added to the BlackBerry smartphone (a + will appear next to the language to install) > Click Apply.
If you're unable to view the desired language in that list , then you have to download and Install a OS pack from any Indian Carrier which include this language on your PC and then try the above method again .Also read those KB :
KB13067 : How to obtain language packs for BlackBerry smartphone.
KB05305 : Localization support for BlackBerry Smartphones.
Let me know if you feel any problem.