This is my Sauerbraten translation to spanish, for those who want it that way.
As before the same advice:
WARNING: I recommend creating a backup of the existing "Sauerbraten\data\menus.cfg", since if something doesn't work, or you want to go back to the original, it's not possible if you overwrited the original unless you reinstall the game.
Instalation: place the downloaded "menus.cfg" in the "Sauerbraten\data\" folder and overwrite the original.
Update v1.1:
Alright, I've actualized it to the new release of Sauerbraten (26-04-2006), and also added some new features.
Again be warned to backup the old "menus.cfg" if you don't want to reinstall all the game.
Enjoy!