pygtk i18n problem---pygtk builtin widgets

I am using pygtk and glade to build apps and I have a problem here. I used some gtk-builtin widgets in my app. And I don't know how to lo开发者_如何转开发calize some label texts. For example

           button =  gtk.BUTTON_YES_NO
           xxxDialog(data, button,text1, text2, xyz)

this would produce a dialog box with two buttons on it, one reads "Yes" and the other "NO". THe question is what sould I do to localize Yes and No to my native language. I do know how to localize texts in python codes(just preappend texts with _() and create a po/mo file), but I don't know how to deal with gtk-builtin widgets. Could you guys please help me with it? Any guidance would be highly appreciated. Thanks in advance.

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You don't have to do anything, built-in widgets are automatically localized.