I have done a bit of searchung and below is what I have found. Looking at the website you mentioned, quite a waste if they really use it as glider airfield as it has been a major military airfield in the past with two long runways. In fact at one point it was considered to become what Orly today is.
The aerodrome was built in the early 1930s by aviation enthusiasts. As war approached, the french Armée de l'Air took it over and shared it for some time with units of the RAF (Royal Air Force) expeditionary forces in France. After the defeat of the BEF (British Expediitionary Force) and the fall of France, the Luftwaffe moved in and improved the facilities; they operated the airfield until late September 1944. After the German withdrawal, it accommodated squadrons of the U.S. Army Air Force (USAAF) and the RAF, being vacated in late September 1945. The aerodrome then languished while its disposition was discussed, though the Air Ministry (France) planned and started to use it as an alternate for the then-busy Le Bourget airport (at that time, the only airport servicing Paris). During this time, NATO (the North Atlantic Treaty Organization) upgraded the field it to its standards. However, by 1960, A.D.P. (Aéroports de Paris) decided to build Orly airport. The die was cast, and the future of Coulommiers-Voisins was again uncertain. From the past there remains a portion of the East-West runway (1,400 x 20 m) that is still in use. Airliners drone overhead en-route to Roissy-Charles de Gaulle International Airport.