@Dereckson I just wanted to say that the code [[Commons:Category:{{#property:P373}}]] and {{Lien Wikipédia}} are included in the french banner template. It has nothing to do with the WikidataPageBanner it was just a way to don't add manually wikipedia and commons links and because banner template is present on all pages. I added a notice in the local pub to remove those links from the banner template.

On french Wikivoyage, the links to relatedsite extention use wikidata links through the page banner template (https://fr.wikivoyage.org/wiki/Mod%C3%A8le:Banni%C3%A8re_page). Remove them is technically very easy.

@Dereckson, the former template Page banner worked on all namespaces so it seemed evident to all that was "just a bug" and users asked why it doesn't work. So the message in the pub was formal to inform that a request was written here. Anyway, thank you for your help.