String & UI change in gnome-panel

[Vincent Untz <vuntz gnome org>]

Hi,

I added a new separator object to the panel. This means new strings and
a new item that might have to be documented in the doc (and appear in
the "add to panel" dialog).

New strings are:
 + N_("Separator")
 + N_("A separator to organize the panel items")

Thanks,

Vincent

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