/**
  * Define translatable searchable fields
  * @return array $searchableFields translatable
  */
 public function searchableFields()
 {
     $searchableFields = parent::searchableFields();
     unset($searchableFields['PublishFrom']);
     $searchableFields['Title'] = array('field' => 'TextField', 'filter' => 'PartialMatchFilter', 'title' => _t('News.TITLE', 'Title'));
     $searchableFields['Author'] = array('field' => 'TextField', 'filter' => 'PartialMatchFilter', 'title' => _t('News.AUTHOR', 'Author'));
     return $searchableFields;
 }