feat(v2): default theme translations: locale "pt" should load "pt-BR" translations #4581
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Motivation
When using Docusaurus with locale "pt", we should try to load theme translations from "pt" and fallback to "pt-BR" (not "pt-PT"!)
"pt-BR" is more widely used than "pt-PT" and it's part of the unicode CLDR.
It's also encoded into the Intl APIs that we use in this PR (note, there's no TS support but it is supported in Node)
Refs:
Have you read the Contributing Guidelines on pull requests?
yes
Test Plan
Tests