change label-inverse to badge-dark

src/server/views/admin/Users_reserve.html

@@ -162,7 +162,7 @@
             <td>
               <img src="{{ sUser|picture }}" class="picture rounded-circle" />
               {% if sUser.admin %}
-              <span class="label label-inverse label-admin">
+              <span class="badge badge-dark label-admin">
               {{ t('administrator') }}
               </span>
               {% endif %}