Kevin Chau's German Dictionary
This project builds a bilingual German-English and English-German dictionary for macOS's built-in Dictionary application.
To build:
cd dictionary
make all install
This should convert the dictionary entries defined in the XML file into an Apple dictionary format, and then place it in the ~/Library/Dictionaries folder.
All you have to do after that is open Dictionary.app, go to menu Dictionary > Settings or shortcut cmd + ,, then check the box for Kevin Chau's German-English Dictionary.
You'll need to restart Dictionary.app every time you rebuild the dictionary, but you do not need to re-add the dictionary.