iPhone: UIBarButtonSystemItemSave and Localization

I'm using the UIBarButtonSystemItemSave to get a Save button in my iPhone app. My idea was that using these system items, I should get automatic localization for these buttons. But it still says "Save" in all languages. Isn't they automatically translated? Do I need to do it myself?

My Code:

UI开发者_如何学CBarButtonItem* saveItem = [[UIBarButtonItem alloc]  initWithBarButtonSystemItem:UIBarButtonSystemItemSave 
    target:self action:@selector(saveButtonClicked:)];
self.navigationItem.rightBarButtonItem = saveItem;
[saveItem release];

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Strange... In my app it translates autoatically.