That's a good point actually, I totally missed that. I think we should have all our characters use English as their general language of communication. Those who share languages can use them if they like but we can assume most of the dialogue will be English. 

As for character relationships, at their core they would be friends. The Wolves were like a family to each other the first time round. They were brought together and those who stayed the full three years, which seems to be all of us, would have grown quite close. Rivalries can certainly exist but at the heart of it we're all friends.