I think thepowdertoy should be translated, it would be easy as there are only a few strings to translate, and a lot of PT users, some of which may be bilingual.

Just put the strings that matter into a file called the language(espanol.txt, english.txt, default.txt) like this particularly shiny game: http://mars-game.sourceforge.net/?page_id=8

in /data/locales

and when the game is first run show a 'pick your language' screen