message: Ooops, restore a bit of RoomCreateDialog content I have accidentally
  removed while trying to solve merge conflicts (thx
diff: @@ -55,6 +55,19 @@ export default React.createClass({
  <div>
  <input id="textinput" ref="textinput" className="mx_CreateRoomDialog_input" autoFocus={true} size="64" />
  </div>
  + <br />
  +
  + <details className="mx_CreateRoomDialog_details">
  + <summary className="mx_CreateRoomDialog_details_summary">{ _t('Advanced options') }</summary>
  + <div>
  + <input type="checkbox" id="checkbox" ref="checkbox" defaultChecked={this.defaultNoFederate} />
  + <label htmlFor="checkbox">
  + { _t('Block users on other matrix homeservers from joining this room') }
  + <br />
  + ({ _t('This setting cannot be changed later!') })
  + </label>
  + </div>
  + </details>
  </div>
  </form>
  <DialogButtons primaryButton={_t('Create Room')}
  