The Motorbuch version has been translated and was published by Schiffer in 2004.
"Jagdgeschwader 7, The World's First Jet Fighter Unit 1944/19452 by M.Boehme [Schiffer, 2004] ISBN: 978-0887403958
There are currently 23 example on Abebooks
here.
The Osprey book by Robert Forsyth & Jim Laurier is a nice potted version of the Motorbuch/Schiffer but also updates some of the info from the older Boehme edition. I'd recommend both...
Cheers
Peter D Evans
LEMB Administrator