We take the first language from intl.accept_languages, merge in the OS locale, then take the rest. When your OS locale matches the app locale, great. When it doesn't, but the localized pref already has useful values, we reorder for no real reason. For example, with OS locale en-US, app locale es-ES: Default intl.accept_languages = es-ES, es, en-US, en Setting intl.accept_languages to es-es,en-us,es,en We should check whether all the locales we want are present in the default string. If they are, just use that.

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