Actually, we had a discussion about this exact issue a while back iirc. Like how UK members were complaining about the spelling of "rumors" on the front page. It's only a few different words anyway. Just think of it as "visible evolution" of a language.
I for one have never had problems except where I had not encountered a word before. If it weren't for these forums, I wouldn't know half the British insults I do.
Back on topic, I would say if you can pay, you shouldn't P2P.