Remove "Menu" from the name of the Settings menu

Its presence makes Orca present "Settings Menu menu". Removing it does
not introduce any new strings.

https://bugzilla.gnome.org/show_bug.cgi?id=708080

js/ui/panel.js

@@ -804,7 +804,7 @@ const AggregateMenu = new Lang.Class({
     Extends: PanelMenu.Button,
 
     _init: function() {
-        this.parent(0.0, _("Settings Menu"), false);
+        this.parent(0.0, _("Settings"), false);
         this.menu.actor.add_style_class_name('aggregate-menu');
 
         this._indicators = new St.BoxLayout({ style_class: 'panel-status-indicators-box' });