(bug 38670) Provide a no results found view

Provide a view showing:
- A feedback message where the current search term is displayed.
- Suggested options: based on likely languages and languages with one
additional level of editing distance than the used in the search algorithm.
- Instructions for search and browse including links to all the sub-regions
available.

* Introduced success, noresults callbacks for language and region filters
* Region filter can be a link for a region alone.

Change-Id: I713b62911bb32e1b1427320ced767b144180c5c4

resources/css/ext.uls.css

@@ -42,10 +42,18 @@
 	padding-left: 15px;
 	color: #777;
 }
+.uls-menu h2 {
+	padding-left: 6px;
+	margin-top: 0px;
+	margin-bottom: 15px;
+	border-bottom: none;
+	color: #777;
+}
 .uls-menu h3 {
 	padding-left: 0px;
 	margin-top: 0px;
 	margin-bottom: 15px;
+	border-bottom: none;
 }
 .uls-worldmap {
 	/* @embed */