feat(types): LangTag types languageName prop using LanguageName utility type
#388
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#386 added a
LanguageNameutility type.Similar to #387, this applies the utility type to the
languageNameprop inLangTagto improve DX. The widened string literal union trick is used to afford autocomplete while allowing any string.This also adds an e2e test for
LangTag. Even thoughLangTagis an abstraction (not intended to be used directly), it's still worth adding a test case.