gui: Fix editing devices (fixes #3236)

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3237

gui/default/index.html

@@ -539,7 +539,7 @@
                     </tr>
                     <tr ng-if="deviceFolders(deviceCfg).length > 0">
                       <th><span class="fa fa-fw fa-folder"></span>&nbsp;<span translate>Folders</span></th>
-                      <td class="text-right">{{deviceFolders(deviceCfg).join(", ")}}</td>
+                      <td class="text-right">{{deviceFolders(deviceCfg).map(folderLabel).join(", ")}}</td>
                     </tr>
                   </tbody>
                 </table>