Theoretically, you could translate every question and answer we have so long as you provide proper attribution, but with over 3 million questions and 7 million answers (and more being posted every day), you'd have a hard time keeping up.
We have a site proposal for Stack Overflow (in Portuguese) in our Area 51 site where new Stack Exchange sites are proposed and gain a following before being created. I suggest committing to that proposal to show your support instead.
At this point it's too early to tell how viable it's going to be when launched, how we're going to go about it, or even when we'll be able to make it a site, but we are looking at localization issues and at how we can bring Stack Exchange in general and Stack Overflow in particular to more languages and countries, so the future is bright and full of promise. :)