chinese i18n fix (#17190)

* fix: fix dialog some key capitalization

* chore: remove audio duplicate key. (i18next can't use it! maybe need change key name? )

* feat: add chinese missing keys.
fix: fix some keys error

* feat: add chinese readme file

* feat: add system feature pages embeddings i18n keys

* fix: fix audio file keys wrong

web/public/locales/zh-CN/views/settings.json

@@ -321,7 +321,7 @@
     },
     "improveContrast": {
       "title": "提高对比度",
-      "desc": "提高较暗场景的对比度。默认值：开启"
+      "desc": "提高较暗场景的对比度。<em>默认值：启用</em>"
     },
     "toast": {
       "success": "运动设置已保存。"