Well, there are occasional messages in Polish:

- the ear stands for uttering the current word/phrase. It prefixes the phrase with "Aktualne hasło to" (which means "the current phrase is")

- the mouth stands for setting the new word/phrase. It asks the question "Podaj nowe hasło" ("provide a new phrase")

- when you win, it says "gratulacje, udało ci się ułożyć wyrażenie..." ("congratulations, you managed to solve the phrase...")

I think that the Android speech services would localize the most important parts of the game.

(I'd be even curious to see how it behaves on non-Polish devices)
And beside all this, the game is pretty universal (although probably terribly boring, if you already know how to spell)