Why is there only one language in GW2?
Like, I understand that Humans had a huge civilization in the past, and that sylvari just know things, but why aren't there Charr who speak in a cat-like growl or a norn speaking some scandanavian-based language. Characters are traveling to far-off continents which have been isolated for centuries and are greeted with a simple "Hello".
In cannon, there seem to be a few languages hinted at (Ancient Dwarven, Skritt, the Quargian's OOO, the Hylec's Mastery Language or Choya dance), but for the most part, the common tongue seems to be everywhere.
If the reason is "Magic" that's fine and all, but at least give a reason.