dd-588 refactor and fix explanation message shown on field non valid
dd-588 refactor and fix explanation message shown on field non valid

ministryofjustice/opg-digi-deps-client,ministryofjustice/opg-digi-deps-client,ministryofjustice/opg-digi-deps-client,ministryofjustice/opg-digi-deps-client