Small string changes to gnome-settings-daemon and gnome-control-center

[Sebastien Bacher]

Hey

The email is a bit late but recently we changed those strings

* gnome-settings-daemon

To fix https://launchpad.net/bugs/964178
"[UIFe] Make keyboard layout indicator more consistent"
https://wiki.ubuntu.com/KeyboardSettings?action=diff&rev2=10&rev1=8

In the keyboard indicator:
- "Keyboard Preferences" got renamed "Keyboard Layout Settings..."
- "Show Current Layout" got renamed "Show Layout Chart"

* gnome-control-center

to fix https://launchpad.net/bugs/968290
"System settings -> Appearance -> Theme entries don't appear translated"

- the string "default" (displayed in the theme selector combo) got 
marked translatable


--
Sebastien Bacher