Iredc: Hey, thanks for the links! Yeah, the German translation has been around for a while, and it only covers the intro and some miscellaneous graphics and text. You can understand the battles, but that's about it.
I dug through Brave Tamers at one point, and I think it's the same as Tag and D1 Tamers: Uncompressed graphics followed by an image map, so it knows what order to put the text in. I believe if you open up a graphics editor that supports WonderSwan Color (or Sega Master System/Game Gear, which has the same encoding) and look starting at 20282, you'll find your menus.
Good luck on Brave Tamer as well!