The German version of Legacy of the Dragonborn SE has been updated to version 3.4.1. The update now supports Badgremlis Mod Collection. However, this requires a special installation. You can find the instructions on the description page on Nexus, where you can also download the update.
This update makes the German translation of Badgremlin's collection for Legacy obsolete when you use it with LOTD. These can also be found on the German mod page for Legacy.
If you have problems with the installation, just ask.