In Germany they are called 'Förster' here in the states we call them 'Rangers', and a 'Forsthaus' would be a Ranger Station. Hence, Forsthaus Falkenau or, roughly translated "Ranger Station Falconfield" is just that: a TV show about a Ranger and his job/friends/family in the Black Woods of Germany, complete with all the snowstorms, wild wolves, lost deers and poachers the writers could come up with.