Tiny gnome-panel string change

[Vincent Untz <vincent vuntz net>]

Hi,

I forgot to announce a string change I made a few hours ago in
gnome-panel: "File not found" => "Icon not found"

This string is just part of an error dialog displayed on the terminal.
Nobody should never see it since it probably means gnome-icon-theme is
not installed when we need it...

Thanks,

Vincent

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