* fix(i18n): backfill 194 missing pt-BR keys and add key-parity regression test (#6695)
* Merge branch 'release/v3.8.47' into fix/6695-i18n-drift
Resolve i18n key-parity and CHANGELOG-fragment conflicts:
- Convert the #6695 CHANGELOG.md bullet to a changelog.d/ fragment
(the fragment convention landed on release/v3.8.47 after this PR
branched, per changelog.d/README.md).
- Backfill 61 additional pt-BR keys that entered en.json on
release/v3.8.47 after this PR's original 194-key backfill, so the
PR's own key-parity regression test (tests/unit/i18n-pt-br.test.ts)
stays green against the moving release baseline.