Hello,
I have the same issue - I need to switch between English and Czech (or even German, and Slovak) 10 - 20 times per day and it would be great to have the option to choose my favorite languages and switch between them by some shortcut.
Even more, after some updates, I cannot change the language at all. It is stuck in English and I can't change it in the settings.
I hope that Microsoft fixes this ASAP, because I can't find any polite words to describe how I am unsatisfied with it :-(
Thanks,
Miroslav