Add new language PT-BR

[bjester]

Desired behavior

From @carinediaz: Studio should have translated strings for the Brazilian Portuguese language

Current behavior

Studio does not have translated strings for the Brazilian Portuguese language

Notes

Please target hotfixes branch

[radinamatic]

Strings are translated on Crowdin, with the proofreading pending by @carinediaz.
After that they need to be transferred back in the code, and QA-ed 🙂