Add an All Results tab when filtering the site settings

app/assets/javascripts/admin/routes/admin_site_settings_category_route.js

@@ -8,9 +8,12 @@
 **/
 Discourse.AdminSiteSettingsCategoryRoute = Discourse.Route.extend({
   model: function(params) {
+    // The model depends on user input, so let the controller do the work:
     this.controllerFor('adminSiteSettingsCategory').set('categoryNameKey', params.category_id);
-    return this.modelFor('adminSiteSettings').find(function(category) {
-      return category.nameKey === params.category_id;
+    return Em.Object.create({
+      nameKey: params.category_id,
+      name: I18n.t('admin.site_settings.categories.' + params.category_id),
+      siteSettings: this.controllerFor('adminSiteSettingsCategory').get('filteredContent')
     });
   }
 });