Audible notifications is a confusing term, especially since it could
plausibly mean audible notifications on your phone.
Mobile push notifications is also not great, since most people don't know
what push notifications are.
I removed "receive" from stream settings strings since I think it isn't
necessary, and so that the strings (and translations) would be the same as
what's on the settings pages.
This helps the common case of not liking our default of having audible
and desktop notifications enabled, and not making users adjust the
settings on every existing stream to fix it.
(imported from commit be75edb2c1385d1bd9a289416e2dffd8007f5e0a)