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gnome-manual-duplex is a utility that adds manual duplex to the "Print" menu. It is a CUPS Virtual Printer as well as a standalone utility. It works with *.ps and *.pdf files.
We need translations into YOUR language: http://translationproject.org/domain/gnome-manual-duplex.html OR http://www.transifex.net/projects/p/gnome-manual-duplex OR http://crowdin.net/project/gnome-manual-duplex