[WIP][Feature] Add support for Brazilian Portuguese

[h3rmel]

Adding support for Brazilian Portuguese language.

Currently in progress.

Checklist

• yarn typecheck
• yarn lint:fix
• yarn test
• yarn brl
• yarn changeset
• ui changelog

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Latest commit: b53dfc9

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[chatgpt-codex-connector]

Preserve pt-br locale when navigating

Adding the pt-br labels here makes the nav show Portuguese, but clicks still call getLocalizedPath(locale, ...) which only prefixes cn, so after selecting Portuguese the next nav click drops ?locale=pt-br and pages revert to English; Portuguese users can’t stay localized.

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