message: TabbarItem: add ability to show badge
diff: left: calc(100% - 9px);
  }
  + .TabbarItem__badge {
  + position: absolute;
  + top: -6px;
  + right: -7px;
  + }
  +
  .Tabbar--l-vertical .TabbarItem__text {
  font-size: 10px;
  line-height: 12px;
  