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

@@ -45,7 +45,7 @@
     "discardChanges": "放弃更改",
     "saveChanges": "保存更改",
     "editAsText": "以文本形式编辑",
-    "increaseFontSize": "Increase font size",
+    "increaseFontSize": "增大字体大小",
     "decreaseFontSize": "Decrease font size"
   },
   "download": {