Recebi este informação interessante:
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You ask:
Also, it appears that sub-locales are not supported (pt_BR being a sub-locale of pt and sharing a high percentage of translation strings). Am I misunderstanding?
Crowdin automatically share translations between pt_BR and pt_PT locales. Actually, the translations now submitted automatically but they appear as an suggestions with high priority for translators so it's much easier to translate to one of the languages if there are translations to another.
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Espero que seja útil.
Tchau,
Richard