That could be a good idea, though at the current state : there is no easy way to integrate several languages on the wiki.
First, the wiki is hosted by wikia, and I suppose even fromhell doesn't have full control over it.
Second, I'm not sure mediawiki engine handles internationalization natively, and several subdomains (en. , de., hu., fr. ...) are usually used.
For french speaking guys, we started a wiki by ourselves on another website (
http://openarena.tuxfamily.org ).
It is more than a simple Wiki, though, and we're planning to do more.
If your efforts mainly consist into translating documentation, you could subscribe to a new wikia account, with a name inspired by the original wiki address (such as openarena-hu.wikia.com ? I'm not sure of which suffix hungarian use), then that would be fine I think
The license of the official wiki uses GNU FDL, I don't know it well but I'm quite sure it allows translations to be made
You'll just have to use that license too.
You'd also have to put efforts into setting up the wiki with the same graphical theme than the official one (could be as simple as selecting a theme in a list of choice, and in fact, nobody enforces you to use the same theme
), and the bad point would be : ressources within the wiki would have to be copied manually from the official wiki, I mean, I'm not sure you can directly use images from OA's wiki, and you'd have to copy them locally, which isn't great effort
Good luck