Add pt-BR translations 🇧🇷

[gustavosobral]

Feature request ✨

Translate the app into Brazilian Portuguese (pt-BR).

The app doesn't have a language selector yet, right? Should it also be part of this feature? Any suggestions?

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I can do this one.

[d12]

In the past, we've had issues with adding translations because we'd like to validate them all with at least a few different people, but we don't have the people to do that. Let's hold off on implementing this for now until we have a game plan there.