nautilus stable string change

[Alexander Larsson <alexl redhat com>]

I added a string "File Manager" to nautilus HEAD (stable branch).
This is used in the task list when the windows of nautilus are grouped.

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 Alexander Larsson                                            Red Hat, Inc 
                   alexl@redhat.com    alla@lysator.liu.se 
He's an obese white trash senator from the 'hood. She's a high-kicking 
Bolivian barmaid with the power to bend men's minds. They fight crime!