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v3.1.2
UIRoot:<html lang>follows the locale. It is set on every locale definition, at start-up and on a change without a reload (setPreferredLocale, a language selector), as a BCP 47 tag (pt-BR, notpt_BR), so fonts (the right CJK glyphs), screen readers and hyphenation follow the language of the texts. New staticUIRoot.setDocumentLang.