feat: Translate frontend/src/i18n/en.json in zh_CN

97% of minimum 50% translated source file: 'frontend/src/i18n/en.json'
on 'zh_CN'.

Sync of partially translated files: 
untranslated content is included with an empty translation 
or source language content depending on file format

frontend/src/i18n/zh-cn.json

@@ -46,7 +46,7 @@
     "saveChanges": "保存更改",
     "editAsText": "以文本形式编辑",
     "increaseFontSize": "增大字体大小",
-    "decreaseFontSize": "Decrease font size"
+    "decreaseFontSize": "减小字体大小"
   },
   "download": {
     "downloadFile": "下载文件",