Accessible error reporting on all forms (admin area and main site)

[denny]

Currently forms only report success/failure, with no clear instructions in the case of failure on what exactly the problem is and how to fix it.

Fields with errors are identified by a red border in the admin area, but this is not an accessible solution; need to add aria-invalid, aria-error, etc.

[denny]

If you are a less experienced developer who is looking at this issue and thinking you'd like to try to take it on but you're not entirely confident, I would be happy to help you - whether that's help getting set up, more explanation of what needs doing, pairing on the code task itself, or anything else I can do to help.

In my day job I'm a lead developer who often mentors less experienced developers, and I'd love to use some of that experience to help people take their first steps into contributing to open source projects.