New Bangle.js 2 menu system

Personally I don't exactly love using the label for this (nor the back button

Yes, ideally we would have an entry for 'back' alongside the title, but I have to be backwards compatible. I've just added a 'back' entry so hopefully we can move new apps to use that when the new major firmware release goes out.

Does using the label add any confusion for translations?

We currently strip out whitespace and punctuation so it wouldn't be the end of the world to strip that (if it's not already handled)