Updated zh-cn translation

One more thing, I found that on my OS X, The newest Haroopad 0.11.0 was not completely showing Chinese (however I have submited zh-cn translation 1 month ago):

In the menu, 'Edit' and 'Window' are in Chinese while other menu entries and menu items are all in English.
The statusbar and the preference dialog are in English also.

I think there might be some bugs, could you have a check?
Thank you!