Shortcut names

There's an enormous number of inconsistent capitalizations in shortcuts.cpp. My understanding is we define three strings for each action: one for the menus (which should be "Title Case"), one for the shortcuts definition (which should be "Sentence case"), and one for help (which I guess should be "Sentence case" as well). I gather that if an action defines only one of these, it is used for all three. Not sure about thsoe that define two. Anyhow, quite a number define only one but use Title Case, so they show up that way in shortcut dialog too. Some use two or three but use Title Case for the second as well, which I think is wrong.

There are a literally dozens of these. Not sure if it really makes sense to fiddle with them now since I assume that would trigger re-translation.

But I am in process of making a PR to remove some unsupported actions and perhaps other cleanups that feel significant enough. If someone wants to go in and clean up capitalization afterwards, be my guest.