use Joomla\CMS\Language\Text;

   // solches 
   htmlspecialchars($rows[$location-1]->title);
   htmlspecialchars($rows[$location+1]->title);
   $row->prev_label;
   $row->next_label;
   
   // ändern zu
   Text::_(htmlspecialchars($rows[$location-1]->title));
   Text::_(htmlspecialchars($rows[$location+1]->title));
   Text::_($row->prev_label);
   Text::_($row->next_label);