PURPOSE
Allow to somehow decorate notification emails headers with a subtitle holding
the record name and some main informations.
SPECIFICATIONS
Next to access button in "Pay Now" notification email, display a subtitle
for some of the main "Send by email" based email flows. It should be something
like 'Invoice REF/01 \n35€ due 11/2022' for account.move or equivalent for
sale.order models.
Task-2712450 (Mail/Sale: Improve 'Pay Now' notification template)
Part-of: odoo/odoo#82167
Thibault Delavallée
5aa0580531