Add Internal Slim version string

This can be accessed in any app using

- android.os.Build.VERSION.SLIM

and corresponds to

- ro.slim.version in build.prop

Change-Id: Ife7dc54f3da0d27b2f389078e206d17f1ffccc95
Fix: es and fr translation

caused bootloop when show battery always was activated
on lockscreen in es and fr

Change-Id: Ib34de6a43ac892e3a5d3b17d38bf56cc35bcff93
Merge remote-tracking branch 'slim/jb4.2' into mirage