If you choose a language+region combination, Edge will automatically set both a language tag for the language+region and a following tag for just the vanilla language in your Accept-Language request. In the dialog box listing languages, however, you will only see the language with the region. For example, if you choose Espaol (Amrica Latina), Edge will automatically add es-419 followed by es in your Accept-Language request, although you will only see Espaol (Amrica Latina) in the dialog box.