Allow for external customization and i8n of the "title" of an RFC 7807 response #29407
Description
Similar to #28814 but for the "title" field, but with a message code resolved as "problemDetail.title." + ex.getClass().getName().
{{ message }}
Similar to #28814 but for the "title" field, but with a message code resolved as "problemDetail.title." + ex.getClass().getName().