The 1545 Luther Bible has the same books as modern day Protestant Bibles. You can check it out on Biblegateway:
http://www.biblegateway.com/versions/?action=getVersionInfo&vid=10
I will note James, Esther, Jude and Revelation are all there. The 1599 Geneva Bible also has all 27 NT books.
So I don’t see where the claim of 7 NT books were tossed by Luther.
I don’t see any 1545 bible at that link. I see a modern reprinting of that bible. Luther treated the NT deuterocanonicals the same way he treated the OT ones: he separated them into the back of the Testament, and inserted a preface denying their authenticity.