Instead of .js.handlebars use .hbs for handlebars templates

app/assets/javascripts/admin/templates/site_settings.hbs

@@ -0,0 +1,34 @@
+<div class='admin-controls'>
+  <div class='search controls'>
+    <label>
+      {{input type="checkbox" checked=onlyOverridden}}
+      {{i18n admin.site_settings.show_overriden}}
+    </label>
+  </div>
+  <div class='controls'>
+    {{text-field value=filter placeholderKey="type_to_filter"}}
+    <button {{action clearFilter}} class="btn">{{i18n admin.site_settings.clear_filter}}</button>
+  </div>
+</div>
+
+<div class="site-settings-nav pull-left">
+  <ul class="nav nav-stacked">
+    {{#each category in controller}}
+      <li {{bind-attr class="category.nameKey"}}>
+        {{#link-to 'adminSiteSettingsCategory' category.nameKey class=category.nameKey}}
+          {{category.name}}
+          {{#if filtered}}
+            <span class="count">({{category.siteSettings.length}})</span>
+          {{/if}}
+          <span class='fa fa-chevron-right'></span>
+        {{/link-to}}
+      </li>
+    {{/each}}
+  </ul>
+</div>
+
+<div class="site-settings-detail pull-left">
+  {{ outlet }}
+</div>
+
+<div class="clearfix"></div>