* Add Brazilian Portuguese (pt-BR) UI localization
* Rebase onto German and French: pt-BR last in the registry, new update strings
Document that pt-PT falls back to Brazilian Portuguese; smoother wording for
'Verifying checksum…'.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Co-authored-by: AlastorIRL <100581152+AlastorIRL@users.noreply.github.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
