I just registered on your site and started solving a few problems. It is too bad you don't have all the statements in English. Hope you'll translate them soon.
It's nice to have an online judge with problems from the international olympiads. Did you ask the authors for the permission to use them?
There are actually not that many problems from international olympiads, but will get better hopefully.
As far as I know the problems are GPL or LGPL, I've also seen the problems on this website as well as a lot of other websites.
And yeah... all the problems will be translated to english... i think that ~70% are in english now