Update Chinese (Simplified) translation

locales/zh-CN.json

@@ -467,5 +467,6 @@
     "Song: ": "歌曲： ",
     "Channel Sponsor": "频道赞助者",
     "Standard YouTube license": "标准 YouTube 许可证",
-    "Download is disabled": "已禁用下载"
+    "Download is disabled": "已禁用下载",
+    "Import YouTube playlist (.csv)": "导入 YouTube 播放列表（.csv）"
 }