The messages "Usage: %s [OPTION...]" "Help options" are provided by popt in applications using popt, but they don't show up translated in those apps (tested this with Nautilus on Red Hat 7). This might be a bug in popt (maybe those strings aren't marked for translation?). Thanks to darin, who has helped me get a clue which strings come from where. The specifics from the Nautilus case can be found at http://bugzilla.eazel.com/show_bug.cgi?id=5504
There was a missing keyword=POPT_ on the xgettext line, now fixed in CVS and i18n robot, tell eazel to look for the fix in popt-1.6.[12] (there's no difference at all, but GNOME has their own copy of popt)) packages.