gnome-power-manager string change

[Claude Paroz <claude 2xlibre net>]

I just committed a patch in gnome-power-manager so that the strings are
easier to translate. I know that this also adds some markup inside
strings, but I think this is unavoidable in these cases in a L10N point
of view.

http://bugzilla.gnome.org/show_bug.cgi?id=549854
http://svn.gnome.org/viewvc/gnome-power-manager/trunk/src/gpm-cell.c?r1=2897&r2=2896&pathrev=2897

Claude
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