N°8123 - Improve on mention data parsing

[jf-cbd]

Base information

Question	Answer
Related to a SourceForge thead / Another PR / Combodo ticket?	N°8123
Type of change?	Enhancement

Objective (enhancement)

Avoid using regex (or at least improve the current one) to detect pattern in HTML

Proposed solution (bug and enhancement)

Use XPath, which is more appropriate and safer than regex

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
• [x] 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

• Existing unit tests are not breaking