Обсуждение: [patch] Minor shutdown message grammar fix

Hi, dev team,

I'm surfacing to offer this minor patch to update the shutdown messaging in the tray menu and various dialogs to use the two-word "shut down" when the message context is a verb rather than the one-word noun usage "shutdown".

For context, see:

* https://blogs.msdn.microsoft.com/oldnewthing/20060912-03/?p=29773/

* https://crowwriter.com/2017/11/27/two-or-one-words-spelling-rules/

Apologies for being the grammar nitpicker, but it's my forte. :-)

Best,

Anthony