Connected app updates (master -> unstable and more)

This request covers a couple of things:

- It takes the latest patch to master, for Connected App version mismatch handling, and merges that into unstable.

- I also took the opportunity to localize the OAuth error-related messages as delivered in `SFAuthenticationManager` (currently for hybrid), and started a helper class for managing SDK resource bundle functionality.

I did *not* yet handle the localization of the native side, as I want to unify the authentication handling in SFAuthenticationManager for native and hybrid, and that's going to take some work on the native side.  I didn't want to go that far afield with what's essentially supposed to be a patch merge here.