Client-side checker not working on several sites

[bdeclerc]

On https://www.digitalwallonia.be/fr it won't show itself, with javascript errors in the browser console log

On https://www.wallonie.be/fr it will run, but you can't access the report page, with errors in the browser console log.

Both work correctly on HTML Codesniffer release 2.1.1 (though that one is "old", released in 2017)

[stefanruijsenaars]

Bugfix in db1a94c (submitted upstream)

and missing french translations (added english placeholders for now)