Saying that, you make a good point Max - it would be unskilled and thus d4-2 with the wild die (at -2) to try and understand, right?

d4 - You could be a tourist in that country and not have too many problems.  You understand many basic things, but your speech is rudimentary.
d6 - You speak the language well enough, though it's obvious to native speakers it's not your first tongue.  Very complex, subtle or technical things may be a bit beyond you, but you could live in a country that spoke only this language and get by just fine.
d8 - Native Speaker, or so close you pass as one.  You were probably educated at the university level in this language, studied it formally, or have simply been speaking it for many years if not your entire life.
d10 - Skilled Grammarian.  You're a veritable wordsmith in the language and can speak in it eloquently without difficulty, with an exceptional vocabulary.
d12 - PhD in the Language, you know its etymology, exact pronunciations, and its many subtleties.  You could write papers on the language's features, and you probably do.

LANGUAGE PROFICIENCY
SKILL ABILITY
d4 The character can read, write, and speak common words and phrases.
d6 The speaker can carry on a prolonged but occasionally halting conversation.
d8 The character can speak fluently.
d10 The hero can mimic other dialects within the language.
d12 The speaker can masterfully recite important literary or oral works.