It is not currently possible to edit an existing Artist-Artist members relationship using French-translated UI, because I stupidly [translated variable name {{

}} by {{

}}|https://github.com/metabrainz/musicbrainz-server/blob/7bf35a72cb51d9f16a040d0c629cc5b0d279c311/po/relationships.fr.po#L5228-L5230] (rather than {{

}}) in Artist-Artist members relationship/link phrase, and because server code does not handle cases where a variable name in link phrase does not match an attribute of that relationship/link type.