Beck’sches Formularbuch Zivil-, Wirtschafts- und Unternehmensrecht (Buch + CD-ROM) Deutsch-Englisch DE-EN
The third edition of this quite useful tome came out in 2014. It has a CD-ROM. I have the 2007 edition and I must admit I’ve scarcely used it, but it appears a lot better than some other such works.
If you find a contract or form that you need, you will also find a bilingual list of vocabulary and notes. The notes are on the German law. There is no discussion of the choice of English terminology, although I can see I would not always use the same. My copy is over 1100 pages long. It might be worth getting hold of a second-hand copy, as there won’t have been massive changes, will there?
This recommendation came with the Kater Verlag newsletter. There, you can click through to the Kater-Scan, which gives a better impression of the contents. But Beck-Verlag also offers details plus Inhaltsverzeichnis and Leseprobe online (Harte Patronatserklärung: Hard Letter of Comfort!)