/**
  * Field labels for display in tables.
  *
  * @param boolean $includerelations A boolean value to indicate if the labels returned include relation fields
  *
  * @return array
  *
  * @author Sascha Koehler <*****@*****.**>
  * @since 20.04.2011
  */
 public function fieldLabels($includerelations = true)
 {
     $fieldLabels = array_merge(parent::fieldLabels($includerelations), array('productsPerPage' => _t('SilvercartProductGroupPage.PRODUCTSPERPAGE')));
     $this->extend('updateFieldLabels', $fieldLabels);
     return $fieldLabels;
 }