Stylesheed and example for compact language list

A searchable list for scenarios where users need to
type/select a language (or more) as input.
The list is made more compact by removing secondary
aids from the ULS to focus on the input task.
Support for back links for uls-compact

Added styles for links that are inserted in the header of the list
to allow the user to go back for multi-step dialogs.

Change-Id: I062086e23d0d5275fd577d9977313b0ac25cf014