> I would also like to make use of collaborative translation
> tools like http://translatewiki.net/ . I am not sure yet on how
> it should work, but I will try to find out. In case that you
> know any details about translatewiki (or any other collaborative
> tool), you can let me know about it.

You can register your project on Transifex:

https://www.transifex.net/projects/add/

(Some internal team repository needed with KDE repo synchronization)

Transifex has all the features you can ask (although implementation is not necessarily ideal). 

But all the real commits (for KDE releases), as it was written before, should be done to KDE SVN repository.

Hope this helps.