Any forum must be made in English first this is the only way for it to show it correctly then you add what language pack you want

This is what I have been saying all along most of your site is not in English and needs to be changed so English members can read it right then the other language pack you have will work better as well

I'd work at the category bar colors a little. Too close to the default. And some custom forum icons maybe. But you seem to run a HUGE forum there, good job ;)