It is possible to use Shalla block list from http://www.shallalist.de with Web Safety. You would need to run the following commands.
# set current working dir
# download block list
# unpack block list
tar -xvf shallalist.tar.gz
# move one dir up to match the folder structure needed for web safety
mv BL/* .
# and reset the owner
chown –R websafety:websafety ./*
Now, open UI / Safety / Settings / Third Party Lists and ensure the folders from Shalla lists were correctly imported into Web Safety UI. To adjust what Shalla category is to be blocked in a given policy, navigate to UI / Safety / Policy / Rule / Custom Categories and select those categories that needs to be blocked.
Click Save and Restart afterwards.