UP-3786:  Remove the 'Popular Portlets' button from the Portlet Manager because it's broken and isn't needed

Conflicts:
	uportal-war/src/main/webapp/WEB-INF/flows/portlet-manager/listChannels.jsp
Merge remote-tracking branch 'origin/rel-4-0-patches' into rel-4-0-patches-upmc
Improving text-shadows : fix bad blur effects on some buttons, lists, ui-li-dividers when a black text has a black text-shadow ; Removed any remaining blur on text shadows for better performance  (@see https://github.com/jquery/jquery-mobile/commit/790317193dff147d504e644e5fb0cfe8605796fa)