code: public static function labelDetail($content, $detail, $options = [])
      {
          $detail = Ui::tag('div', $detail, ['class' => 'detail']);
          return static::label($content . $detail, $options);
      }
docs: Generates a [label that contains a detail](http://semantic-ui.com/elements/label.html#detail)
  
  @param string $content the content of the label
  @param string $detail the detail of the label
  @param array $options the tag options in terms of name-value pairs
  
  @return string the generated label with detail tag