make provider page show global providers for all countries

So the providers page offers a nice filter where you can pick providers who service your country. But quite a few aim to service globally (this is the Internet, after all) and thus we have a 'all' country flag (I stole the UN flag for that).

This works as an option (which is silly) but worse, if you pick 'de' or 'us' you don't see the global providers. And you should! I just have no clue how to make that happen. It's jquery and probably not hard for somebody who knows a bit of javascript... But it is far beyond me. Help out!