English - flaps
A hinged portion of an airplane's wing, generally on the trailing edge, that can be lowered during takeoff and landing to increase the wings' lift and drag. When partially extended, a flap adds lift by increasing the camber, or curvature, of the wing. Because flaps extend into the oncoming air, they also increase drag, helping an aircraft descend steeply without building up speed. Modern aircraft use several types of flaps; the most common designs are plain, split, and Fowler. Often confused with ailerons, flaps are not the primary control surfaces of an airplane.
 
— Microsoft Flight Simulator 2004, Glossary

Etymology: [f. next vb.; cf. Dutch. flap blow, fly-flapper, lid of a can.]

Quotation: 1906 Sci. Amer. 18 Aug. 116/3 One part of the wing..is formed of a series of longitudinal flaps, fixed at the edges to a wire gauze network, so that the flap is made to close when the wing is brought down, but keeps open when the wing is raised. 
—  Oxford English Dictionary, Second Edition, 1989

French –  volet
Italian – flap
Spanish – flaps
German – Klappen
Japanese- フラップ