The hope being that this is clearer that it's about inviting your
coworkers to your instance of the app, rather than about spreading the
love and telling your friends how great Humbug is.
(imported from commit 888576618cdb5469cbfa8964f2b53c7b5120627f)
This is a tricky one because it's kind of hard to see locally, but
there's a bit of a delay between when you click "Invite" and when we
get back to you. So we give the button a "loading" state so you know
not to click again.
(imported from commit 9c3389a3d06def777427c846d6106f6d9b30cc8b)
Jessica McKellar
Waseem Daher