XP after changing interface language
I've always had the app in English but I ran out of Spanish lessons and decided to learn French from Spanish. I had already started French from English. I dont see my XP going up from doing French lessons in Spanish.
Edit: it goes up for overall XP but doesn't seem to go up for French
You're right : you won't see your level in the foreign language going up till you reach from the second language the level you reached from the first one.
Each language learned is only showed once with the highest level.