N°8893 - :lipstick: Transition validation markup

[jbostoen]

Base information

Question	Answer
Related to a SourceForge thead / Another PR / Combodo ticket?	No
Type of change?	Enhancement

Symptom (bug) / Objective (enhancement)

When using for example the new event listeners to perform a check before the object is written during a transition; the current error modal is ugly. It does not use a nice list; and it shows context data.

Proposed solution (bug and enhancement)

The error messages are just examples.

Before:

After:

Checklist before requesting a review

• [x] I have performed a self-review of my code
• [x] I have tested all changes I made on an iTop instance
• [ ] I have added a unit test, otherwise I have explained why I couldn't
• [x] Is the PR clear and detailed enough so anyone can understand digging in the code?

Checklist of things to do before PR is ready to merge

[jf-cbd]

Accepted during functional review. Will check with @rquetiez for technical details (3.2 compatibility and way to define the message).