pt-BR update and new strings

[vitu]

• Translation of new strings*
• Adaptation of previously translated strings to use a more inclusive language*
• Translation consistency amendments*

• All in accordance with Apple's Style Guide

Misc Checklist:

• My change requires a documentation update on Sparkle's website repository
• My change requires changes to generate_appcast, generate_keys, or sign_update

Only bug fixes to regressions or security fixes are being backported to the 1.x (master) branch now. If you believe your change is significant enough to backport, please also create a separate pull request against the master branch.

Testing

I tested and verified my change by using one or multiple of these methods:

• Sparkle Test App
• Unit Tests
• My own app
• Other (please specify)

Translation test only.

macOS version tested: 12.2.1

[zorgiepoo]

Thank you.