First, download resources_jp. http://s3wordpress.wpblog.jp/2016/05/18/android-studio-2-0-%E3%82%92%E6%97%A5%E6%9C%AC%E8%AA%9E%E5%8C%96%E3%81%97%E3%81%A6%E3%81%BF%E3%81%9F/
Next, copy it to the lib folder in the folder where resources_jp.jar is installed.