Incorportate changes to remie: edition screen headers and button for tag addition for CurrentSegmentInfobox + corresponding style, and fix try for Jquery-ui/lab.js bug

// Labels

.label-variant(@color) {
  background-color: @color;

  &[href] {
    &:hover,
    &:focus {
      background-color: darken(@color, 10%);
    }
  }
}