New strings & UI in gnome-panel

[Vincent Untz <vuntz gnome org>]

Hi,

I added new logout/shutdown dialogs to gnome-panel.

For doc people: this means there are two menu items at the end of the
main menu and at the end of the Desktop menu in the panel. Those two
items open new dialogs. The old dialog that asked for confirmation to
logout is not used anymore.

For translators: this means there are ~10 new strings.

Vincent

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