您需要一个Localizable.strings文件.如果已经拥有该文件，请在左侧面板中选择文件.然后，点击右侧面板中应显示本地化..."的按钮

You need a Localizable.strings file. If you already have that, select the file in the left panel. Then, click the button that should be in the right panel that says "Localize..."

完成此操作后，您应该可以按照尝试的方式添加其他本地化版本.

Once you do this, you should be able to add other localizations the way you were trying to.