French biography of a person : Birthdate and Death date are missing
As far as I can see this is the case for all persons, not a special case.
Example : https://test.swissbib.ch/Page/Detail/Person/fa29843e-79d1-3e11-8673-f7b35e336e07 (in french!!)
In dbpedia this looks all right : http://dbpedia.org/page/Herbert_von_Karajan