I agree, the rest of my family doesn't know English that well, only Polish, though my mom also has learned German.
Probably the best way to do that is a text file that contains all the text in the game, that's kinda how TF2 does localisation. This way anyone can translate the game themselves, and considering how little text is in it that shouldn't be a problem. Just make sure it is in Unicode or something, so non-ASCII characters can be displayed.