The weird thing about magic, though, is that when we spend enough time in a given area or interacting with people who speak a certain language, eventually the need to cast the translation spell disappears. Over time, the magic gives a wizard - any wizard - the ability to speak that language without any effort whatsoever. That's how I came to learn English. You see, I actually grew up speaking Austrian and Latin. I was born in Salzburg, Austria. But Burgess, my Teacher and Protector, was from America. Arturo was from Mexico, and Devon was from England. After some time, the four of us became fluent in all those languages, though we used English more often than not.
Of course, once I became the Teacher and Protector, the Three Wizards turned out to be all from the same country - the United States. So, again, English continued to be the language of the day. But occasionally, we end up in places where we need to speak something other than English, and that's why I'm glad we have the spell of tongues.