Solr "Creator" facet title does not get translated

The search result page has "Creator" as one of its facted

The title of the factet widget "Creator" is not been translated like the other facet titles, despite having various translations for key solr.field.creator_display in SolrTranslations.*.xml

Check e.g. with:
http://localhost:8080/xwiki/bin/view/Main/Search?y=0&text=blog*&x=0&f_type=DOCUMENT&f_locale=fr&f_locale=&r=1&language=fr