Hacking Where are the Wonderful 101 language files?

[Steve_Doido]

This may seem like a random question, but it's driving me nuts!
If anybody know where they are, so I can edit them, I'd really appreciate.
Here's a list of them, just in case (the unpacked folder where unpacked from "data000.cpk" and "data001.cpk").

EDIT: the files in LANG don't seem to be text. No idea what they are, actually, probably graphics.