This does not add much functionality. That will come in
future commits.
This commit has many cleanup, refactoring on the display settings,
language settings code.
Change-Id: I7fbc3ebb9b67c1afd80f159c2d82cd2a1c6bea74
Extend $.fn.uls render method to add additional rendering of display
settings link.
Add css for the new element.
Add display.png icon from the Agora icon set.
Change-Id: I7a29b4892be02526969b0dd786c74bdb7551c074
