Copy improvements to error messages (#576)
Copy improvements to error messages (#576)

Some improvements to the error messages for tax and penalty amounts to
allow users to bypass the step when they don't have or know the amounts.
ministryofjustice/tax-tribunals-datacapture,ministryofjustice/tax-tribunals-datacapture,ministryofjustice/tax-tribunals-datacapture,ministryofjustice/tax-tribunals-datacapture