All they are actually asking for is - is there anybody in these geographical zones or that geographical zone that wants to be my language parter. Unless the peoples in the particular zone in question are still living as they were over five hundred years ago, those zones are going to be full of a modern international global mix up different speakers, from anywhere in the world.
I agree it does not take more than a few seconds to type out the country and the language that is being referred to.
Switzerland as a small geographical zone or country the speakers there,I believe speak maybe three or four languages.
And EN could be many things including the code to tell your browser and google what language to use and what country to display your website in, including the associated spellcheckers, grammar checkers and dictionaries.
It goes at the top of the page.
Language ISO Code Abkhazian - ab
Language ISO Code Afar - aa
Language ISO Code Akan - ak
Language ISO Code Arabic - ar
Language ISO Code Amharic - am
Language ISO Code Albanian - sq
Country codes for different grammar is a little different
American us = US
United Kingdom = GB