[pygtk] How to get the gtk stock button label translated?

[卢亚德]

I used self.btnNew = gtk.MenuToolButton (gtk.STOCK_ADD) to get a menutoolbutton. But the label of this menu button didn't get translated. It always displays ad 'Add' in the user interface. I got the information that the translation is pre-built in the Pygtk. But How I can get it translated?
 
Thanks,
Ryan
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