Deleting a sales team now has an explicit, predictable effect on subscription records: the team link is cleared instead of leaving uncertainty. Subscription history remains trackable where it contains useful sales information, helping users preserve context while allowing old teams to be removed safely.

SET NULL

  * sale.subscription: void team_id field but track it as it holds sales
    information people may want to keep as history (no change);
  * sale.subscription.log: void team_id field (no change);

The customer follow-up screen now correctly shows the formatted success message after completing an action. This keeps the confirmation experience clear and consistent for users following up on unpaid invoices.

This commit adds option messageIsHtml: true because now
that message of rainbowman is escaped by default we need to
mark it as html

task-id: 2575435