Sandbox creation error message is not human friendly

[GRyall]

If you try and create a sandbox with a name that is longer than the limit, instead of a human friendly error message you get:
Internal Server Error: (psycopg2.DataError) value too long for type character varying(32) [SQL: "INSERT INTO branch (id, branch_type, name, compiler, is_sync_valid, autosync, owner_id, formats, creation_date, comments) VALUES (nextval('branch_id_seq'), %(branch_type)s, %(name)s, %(compiler)s, %(is_sync_valid)s, %(autosync)s, %(owner_id)s, %(formats)s, %(creation_date)s, %(comments)s) RETURNING branch.id"] [parameters: {'is_sync_valid': True, 'name': 'gocdbdatabaseserverthatffffingworks', 'autosync': True, 'comments': None, 'creation_date': datetime.datetime(2019, 3, 18, 14, 12, 7, 394929), 'formats': None, 'owner_id': 13, 'branch_type': 'sandbox', 'compiler': '/var/quattor/panc/panc-10.7-jar-with-dependencies.jar'}]