[dash] Change section titles to match 20091114 mockup

Documents is changed to Items, and add "& Devices" to Places.

https://bugzilla.gnome.org/show_bug.cgi?id=605491

js/ui/docDisplay.js

@@ -485,7 +485,7 @@ DocSearchProvider.prototype = {
     __proto__: Search.SearchProvider.prototype,
 
     _init: function(name) {
-        Search.SearchProvider.prototype._init.call(this, _("DOCUMENTS"));
+        Search.SearchProvider.prototype._init.call(this, _("RECENT ITEMS"));
         this._docManager = DocInfo.getDocManager();
     },