feat: new check (OPF-092) for language tags well-formedness #1363
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In Package Document, the language tags appearing in the elements or attributes below MUST be well-formed according to BCP47:
xml:lang
attributehreflang
attributedc:language
elementFor these values:
See https://docs.oracle.com/javase/8/docs/api/java/util/Locale.Builder.html#setLanguageTag-java.lang.String-
Fix #1221
Close #702