On November 1, 2020 there was a change to fr.po to change the translations, but any changes to the translations need to be made through the Translation Project (https://translationproject.org/html/welcome.html). Otherwise the changes are going to be wiped out when the translation files are updated from source.
If we really want to change the files we get from the Translation Project, this should be done with a patch or filter that modifies the translation files and would apply to updated ones. At some point, when the upstream files were updated, this patch could be removed. I remember this was done before although I can't remember why.
