String change in gnome-panel

[Vincent Untz <vuntz gnome org>]

To fix some lockdown feature not correctly working, a gconf key had to
be deprecated in gnome-panel, and its description was updated to point
out to the right gconf key.

See http://bugzilla.gnome.org/show_bug.cgi?id=317609 for details.

Thanks,

Vincent

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