I merged the english file with the german, using english for all missing text entries.

1. Download the file from here: https://drive.google.com/uc?export=download&id=0B7YYVr6kQm2hNnlTTDRIYzlmNmc
2. Place it into your game folder, with steam it's Steam\SteamApps\common\Divinity - Original Sin\Data\Localization\German