As a Wikidata editor, I expect the Before Common Era (BCE) dates in French to read "années ..." as in [1], instead of "an ..." as in [2].

[1] https://www.wikidata.org/wiki/Q1367119?uselang=fr#P571
[2] https://www.wikidata.org/wiki/Q1785592?uselang=fr#P571

See Discussion on Wikidata:Contact_the_development_team