Hi!
You might be surprised (I'm kidding
), but all people here know English (someone worse, someone better), many know German (not me) and French (not me again...) and also Russian (oh! that's me!). So:
You are welcome here 
and if you do know Russian ("that's what you said!") it won't be a problem for you to use this forum.
And I suppose it can be interesting for all of us here