That's actually pretty brilliant. It wouldn't be a language learning game but it would augment more formal instruction by assisting in building vocabulary. You

That's actually pretty brilliant. It wouldn't be a language learning game but it would augment more formal instruction by assisting in building vocabulary. You could probably build in 5-7 new words a week and show 3-5 old words a week as well. Then of course you can put billboards and graffiti in a game where appropriate in the language using words the game has taught (or will teach). In the load screens/waiting rooms it could be pretty simple too, the game could show and say the word then give you a grid of like 9, 16, 25 words to choose from and make you pick the correct one. The first few times you'd probably struggle but if you were playing for an extended period in a session, or over a week, you'd get that reinforcement every round/match/zone and be able to quickly select the correct words.