Fixed an internationalization issue with FallbackKeyProcessor

The FallbackKeyProcessor was using the hard coded names for the well
known scopes.  These names are different on international installs of
Visual Studio and hence the proper fallback logic wasn't being applied
in those scenarios.  Switched the code to use the dynamically calculated
names instead.
Merge branch 'master' of https://github.com/jaredpar/VsVim