Adding a new printer requires administration password

When trying to add a new printer with Application > System > Administration > Printers, I’m now asked for the root password. IIRC, this is not the normal behavior with Tails.

Feature Branch: feature/jessie

Related issues

Related to #7636 (closed)
Related to #8505 (closed)
Related to #10965 (closed)

Original created by @matsa on 8443 (Redmine)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information