To uninstall debian-faq-de just follow these instructions.
/debian/stretch/main///install/index.html Debian Frequently Asked Questions, in German Debian 9.0 doc 8.1
sudo apt-get remove debian-faq-de
Which will remove just the debian-faq-de package itself.
sudo apt-get remove --auto-remove debian-faq-de
This will remove the debian-faq-de package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for debian-faq-de then this will work.
sudo apt-get purge debian-faq-de
Or similarly, like this debian-faq-de
sudo apt-get purge --auto-remove debian-faq-de
|Maintainer||Javier Fernandez-Sanguino Peña
|Description||Debian Frequently Asked Questions, in German|