If you want to contribute your skills and translate PVK II to your language you should head to Steam Translation Server: http://translation.steampowered.com/
It has all languages available that Steam has and it's based on peer-reviewing.
Only thing you have to do is to pass a simple translation test that is accepted by the moderators. After that you can start translating.
The localization file will be uploaded from STS to the patch next time PVK II is updated.
We will start to provide patches more often to get those new translations in-game too.