Ok, so I'm trying to set my system general language to pt-BR, I already downloaded pt language pack with Language Support app, but no languages are shown on System Settings/Language & Region, just a "blank" window. Even when I tried to download English packages the language won't show up on settings, so I really think the trouble is something about languages not showing up on settings, because I already checked others questions with similar problems and followed its steps, but again, nothing works. What is going on? How can I set my system language to pt-BR?
Here's some screenshots:
Language Support app:
System Settings/Language & Region:
The very last line of the sidebar has a "+" button, just click it and search the preferred language.