Improve returned suggestions
When working on T340585, two issues were noticed with this script:
- it strips namespace prefix (instead of Template:Infobox, it yields Infobox), which is not compatible with the expectations set for GEInfoboxTemplates (since f138cc9 / 47e0304, GEInfoboxTemplates no longer presumes NS_TEMPLATE as the default namespace).
- its Wikidata query searches for infobox templates on ie. all French projects, rather than just the French Wikipedia.
See https://www.mediawiki.org/wiki/Topic:Xksrdpg0w7sf6166 and attached task for details.
Bug: T340629