He was born and raised in Anchay, France, and while he traveled extensively for work, he likely never lived in another country for long periods.
It's also possible he had some knowledge of German. The Alsace region of France, where he was born, was part of Germany for a period, and he likely interacted with German-speaking people.
However, it's important to remember that we're speculating. We don't have any documented evidence about his language abilities beyond French.