Hello Mohit,

there is one file that you want to install, to have Hindi as a KDE language. It is called "kde-i18n-hi"

If you do the remaster this the scripts of Fabian Franz or the tutorial of UnderScore that you will find here:
http://www.knoppix.net/forum/viewtopic.php?t=13867
you can do the changes in the chroot enviroment.

You have to be on the root console and do:
apt-get update
apt-get install kde-i18n-hi

There is also a file for openoffice. It is called openoffice.org-l10n-hi

With dpkg-query -S kde-i18n you can search all language packages that are installed to your system.
So you can delete for example the german ones with:
apt-get remove kde-i18n-de

I hope this helps you with the remastering process.

Greatings
Christian