Improve tools list code

There is a tiny HTML error I fixed in my first commit.

I've also added text on those links: you can see [Checklist Opquast V2 - Critère 41](http://checklists.opquast.com/fr/oqsv2/criteria/540/) and [AccessiWeb 2.1 - Critère 6.6](http://www.braillenet.org/accessibilite/referentiel-aw21/liste-deploye.php#crit-6-6) references.