I have no problems with english, but some friends of mine which I bought the game along too does. It'll be nice to have some messages in every language that are locally dependant: If I hit a button labeled "Hi" in english, spanish people would real "Hola", the french "Salout", japanese "Konnichi Wa" and so...
Some important messages would be: "Hi", "Bye", "BRB", "Back/Defence", "Push/Attack", "Good Job", "Target $mytarget"
Additional thought: A fastkey to lock/label an enemy demigod and a second one to target labeled demigod, so the team will have more info about targets in big clashes withouth any language issues.