gnome-control-center UI and string freeze break request

[Marek Kasik <mkasik redhat com>]

Bug 698532 - Do not prompt for remote username / password when adding
printer
https://bugzilla.gnome.org/show_bug.cgi?id=698532
(screenshot -
https://bug698532.bugzilla-attachments.gnome.org/attachment.cgi?id=253939)

This change improves installing of printers shared on samba servers. It
shows authenticated servers in the list of available devices and allows
user to authenticate against them. The printers available on such
servers are added to the list after authentication.
I tried to do it as minimal as possible.

This is an UI change and string change.

The change was accepted by designers.

Regards

Marek