[MERGE] OPW 57677: sale: aggregate warning messages when changing product on sale...

[MERGE] OPW 57677: sale: aggregate warning messages when changing product on sale order line

  * aggregate warning message displayed when changing product on sale order
    line in a unique warning, to prevent multiple round-trip.
  * re-generated i18n template as some string was untranslated before.
  * fix problem introduced into odo@openerp.com-20120629161321-ytwffsko2e5esj8b
    which prevents the warning that product is not matched in choosen pricelist
    to show up.

bzr revid: xal@openerp.com-20121204132903-ymp8e4shmrgksesj