Use "More" instead of "Browse"

The text "Browse" used for the buttons on the dash section headers is a
little obscure and tends to translate into something that doesn't fit
well.

Going back to "More" will hopefully be more manageable in translation.

https://bugzilla.gnome.org/show_bug.cgi?id=596433

js/ui/dash.js

@@ -397,7 +397,7 @@ MoreLink.prototype = {
 
         let text = new Clutter.Text({ font_name: "Sans 12px",
                                       color: BRIGHT_TEXT_COLOR,
-                                      text: _("Browse") });
+                                      text: _("More") });
         this.actor.append(text, Big.BoxPackFlags.NONE);
 
         this.actor.connect('button-press-event', Lang.bind(this, function (b, e) {