Hello everyone!

I am playing with the client i downloaded on the website, and im having so much fun. But a friend of mine wants to play and he doesnt understand english very much, and i found on the internet a patch to translate the wotlk to Portuguese, just like Blizzard did in Cataclysm.

My question is: is it allowed to use this patch to play on this server? Or he will get banned?

Thanks!