This is kind of weird, but cool at the same time.
I was looking through Mario and Luigi: Superstar Saga (for the GBA) in a hex editor. And I noticed two strange things:
The text is all in ASCII so you don't even need a table file.
There is both French, and German text in the game (I assume the full game text).
Since I don't see any options to change the language anywhere in the game, if it hasn't been released in French or German it would be fairly easy to translate, since the text is already translated for you.