uiLocales property
UILocales is the End-User'id preferred languages and scripts for the user interface, represented as a space-separated list of BCP47 RFC5646 language tag values, ordered by preference. For instance, the value "fr-CA fr en" represents a preference for French as spoken in Canada, then French (without a region designation), followed by English (without a region designation). An error SHOULD NOT result if some or all of the requested locales are not supported by the OpenID Provider.
Implementation
@BuiltValueField(wireName: r'ui_locales')
BuiltList<String>? get uiLocales;