Provide ability to override field validation message

As an example, a Text field that requires a phone number format (via RegEx) shows a note like:

  • Field must respect a specific regexp format: /^(\d\d\d-\d\d\d-\d\d\d\d)$/

This just isn’t very user-friendly as the average content editor likely doesn’t know what “regexp” means, nor can they understand what the format is asking for.

The idea is to provide a human-friendly “override” for this, such as:

  • Phone number format should be NNN-NNN-NNNN, e.g. 302-555-1234