Small UI improvements for clarity/continuity:
1. In the "Sales' onboarding wizard > payment configuration >
documentatlion link", font roboto is now used.
2. In the sales order, the error message when 'there is nothing
to invoice' now also explains also what the user has to do to invoice
"Prepaid" services.
3. In the "Payment confirmation" section of the payment portal,
'Reference', 'From' & 'Amount' fields don't look like editable
fields anymore.
4. In the payment forms, tokens created with the Test acquirer
are now identified with a "Test Token" badge in place of the
verified token checkmark.
task-2505913
closesodoo/odoo#70076
Related: odoo/enterprise#18036
Signed-off-by: Antoine Vandevenne (anv) <AntoineVDV@users.noreply.github.com>