I've found mention of them BUT, I don't find them. Ideally, I seek the all-positive versions. Thanks!
André is right. I found a Portuguese one for you: http://meiert.com/en/blog/20091127/sus-how-to-grade/ (near the bottom of post, in updates).
There's also a good chance that you are seeing references to versions of the SUS that the researchers themselves have translated.
I know this is a really old question, but just in case someone else needs it for future reference, try Sistema de Escalas de Usabilidad: ¿qué es y para qué sirve? in Spanish
(Disclaimer: I'm the author of the article)