Hi kuruya. Currently the installer is available in English language. Though, you can change the system language once installed. To do that you have to edit the /etc/profile.d/lang.sh file and replace en_US by pt_BR.
Keep in mind the translations depends on the applications and some of them are better than another ones. Personally I find KDE doing the better job on this, and I install it on my friend's computers when they don't want to deal with English. They usually are Spanish speakers (I am from your neighborhood