Honestly, I'm surprised it took this long. I would've assumed that it would've been available in German earlier. But there we are, then.
From the release:
We are very pleased to announce the German translation of the Bolt Action rulebook – our second translation of this award-winning game following the recently released Spanish version.
The nice chaps at Warehouse Games have done the translation and produced the book, and all the errata have been added to ensure the rules are completely up to date!
This also means that we can now offer our D-Day Firefight Bolt Action Starter Set with the German rulebook replacing the English mini rulebook.