Currently markup-ification of the legacy notifications system display the html content in notification layout for some of the notification of document and planning from commit: https://github.com/odoo/enterprise/commit/ba44461fea337ed2e5adbdfa1e8eede00b036def So here in this commit, we make the method `makeLegacyNotificationService` always `_.escape(message)` and pass `messageIsHtml: true` to the owl notifications system so notification with html content will be displayed properly. Task-2657391 closes odoo/odoo#78627 X-original-commit: 7ce6d8d70be79c9c626865598b898dce9a18b045 Related: odoo/enterprise#21782 Signed-off-by: LTU-Odoo <IT-Ideas@users.noreply.github.com>