[IMP] l10n_it_account_stamp: Usability for stamp in invoice. #3452
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If stamp line can be added (invoice in draft): show button to add stamp line. If stamp line can't be added (invoice not in draft): show message explaining why it can't be added. If stamp line has already been added: show message saying it has already been added (useful if invoice has many lines). Button and messages update live while updating the invoice. Better messages to user for charging stamp to customer