/**
* Return the sortable label.
*
* @param string $size
* @return null|string
*/
protected function sortableLabel($size = 'sm')
{
if ($this->object->isSortable()) {
return '<span class="label label-primary label-' . $size . '">' . trans('streams::field.sortable.name') . '</span>';
}
return null;
}
