UIFe: Add Additional Printer Settings button & tweak another string

[Jeremy Bicha]

Hi,

I am requesting a User Interface Freeze Exception to add an
"Additional Printer Settings" button to Settings>Printers in Ubuntu
17.10. That button will open system-config-printer (which was the
Printers panel in Ubuntu 17.04 and before).

Also, we are renaming the "Screen position" string in Settings>Dock to
"Position on screen".

Both string changes are in the gnome-control-center package.

More detail is provided at these bugs:

https://launchpad.net/bugs/1718083
https://launchpad.net/bugs/1715869

Thank you,
Jeremy Bicha