prefix_porte_plume_barre_pre_charger($barres) {
  $barre_edition = &$barres['edition'];
  $barre_forum = &$barres['forum'];

  $barre_edition->set('header1', array(
    ...
  ));

  $barre_forum->set('header1', array(
    ...
  ));
 
  return $barres;
}