You could send a mail to webmaster at pokerth.net to register as the official Czech translator.
In the meantime, you could try to get QT Linguist installed. Then, download pokerth_START_HERE.ts from here
http://pokerth.svn.sourceforge.net/viewv...rth/trunk/pokerth/ts
rename it to pokerth_cz.ts, open it with QT Linguist and start translating. To test, you can 'release' the .ts file to a file called pokerth_cz.qm and copy that file to the data/translations dir and change the lang setting in config.xml to cz (I think that works).
If you have a good pokerth_cz.ts and working pokerth_cz.qm, you can publish them on the forum too for people to use, like the Finnish translator did:
http://www.pokerth.net/forum?func=view&catid=26&id=3378#3451
If you'd like, join the #pokerth channel on irc sometime to chat with xanax`, doitux, gui and me - we've been involved with pokerth translations for a while.
Good luck, and thanks for your involvement!