Updating Chinese (Simplified) translations (#5643)

* i18n: (zh-CN) Bug fix for note-counter.

* i18n: (zh-CN) Improve translations

* i18n: (zh-CN) Improve translations

* i18n: (zh-CN) Add missing translations

* i18n: (zh-CN) Improve translations

* i18n: (zh-CN) Add support.array key for better wording

* Revert "i18n: (zh-CN) Add support.array key for better wording"

This reverts commit 27bf9a946e886213e827cd985d4f62419db57534.
Looks like this commit can't get pass the checks, revert it for now.

* i18n: (zh-CN) Change `客户端` to `应用`

* i18n: (zh-CN) Improve translations

* i18n: (zh-CN) Add missing translations (#5635)

* i18n: (zh-CN) Change `两步验证` to `双重认证`

* i18n: (zh-CN) Improve translations

app/javascript/mastodon/locales/zh-CN.json

@@ -49,9 +49,9 @@
   "compose_form.placeholder": "在想啥？",
   "compose_form.publish": "嘟嘟",
   "compose_form.publish_loud": "{publish}！",
-  "compose_form.sensitive": "将媒体文件标记为“敏感内容”",
-  "compose_form.spoiler": "将部分文字隐藏于警告消息之后",
-  "compose_form.spoiler_placeholder": "隐藏文字的警告消息",
+  "compose_form.sensitive": "将媒体文件标记为敏感内容",
+  "compose_form.spoiler": "折叠嘟文内容",
+  "compose_form.spoiler_placeholder": "折叠部分的警告消息",
   "confirmation_modal.cancel": "取消",
   "confirmations.block.confirm": "屏蔽",
   "confirmations.block.message": "想好了，真的要屏蔽 {name}？",
@@ -90,7 +90,7 @@
   "getting_started.appsshort": "应用",
   "getting_started.faq": "常见问题",
   "getting_started.heading": "开始使用",
-  "getting_started.open_source_notice": "Mastodon 是一个开放源码的软件。你可以在官方 GitHub（{github}）贡献或者回报问题。",
+  "getting_started.open_source_notice": "Mastodon 是一个开源软件。欢迎前往 GitHub（{github}）贡献代码或反馈问题。",
   "getting_started.userguide": "用户指南",
   "home.column_settings.advanced": "高级设置",
   "home.column_settings.basic": "基本设置",
@@ -204,6 +204,7 @@
   "tabs_bar.home": "主页",
   "tabs_bar.local_timeline": "本站",
   "tabs_bar.notifications": "通知",
+  "ui.beforeunload": "如果你现在离开 Mastodon，你的草稿内容将会被丢弃。",
   "upload_area.title": "将文件拖放到此处开始上传",
   "upload_button.label": "上传媒体文件",
   "upload_form.description": "为视觉障碍人士添加文字说明",