Add Simplified Chinese support (#122)

* Add Simplified Chinese support

And distinguish it from Traditional Chinese.

* Add two fields for translation.

* Add two fields for translation.

* Translated.

translation.json

@@ -351,8 +351,74 @@
       }
     },
     {
-      "name": "中文",
-      "code": "ch",
+      "name": "中文(简体)",
+      "code": "simpch",
+      "translation": {
+        "AppName": "文件管理器",
+        "AppTitle": "文件管理器",
+        "Login": "登录",
+        "Username": "账号",
+        "Password": "密码",
+        "Logout": "注销",
+        "Move": "移动",
+        "Copy": "复制",
+        "Save": "保存",
+        "SelectAll": "全选",
+        "UnSelectAll": "取消全选",
+        "File": "文件",
+        "Back": "返回",
+        "Size": "大小",
+        "Perms": "权限",
+        "Modified": "修改时间",
+        "Owner": "所有人",
+        "Search": "搜索",
+        "NewItem": "新文件",
+        "Folder": "文件夹",
+        "Delete": "删除",
+        "CopyTo": "复制到",
+        "DirectLink": "直链",
+        "UploadingFiles": "上传文件",
+        "ChangePermissions": "修改权限",
+        "Copying": "复制",
+        "CreateNewItem": "创建新文件",
+        "Name": "文件名",
+        "AdvancedEditor": "高级编辑",
+        "RememberMe": "记住我",
+        "Actions": "动作",
+        "Upload": "上传",
+        "Cancel": "取消",
+        "InvertSelection": "反选",
+        "DestinationFolder": "目标文件夹",
+        "ItemType": "文件类型",
+        "ItemName": "文件名称",
+        "CreateNow": "创建",
+        "Download": "下载",
+        "UnZip": "解压",
+        "UnZipToFolder": "解压至文件夹",
+        "Edit": "编辑",
+        "NormalEditor": "普通编辑",
+        "BackUp": "备份",
+        "SourceFolder": "源文件夹",
+        "Files": "文件",
+        "Change": "修改",
+        "Settings": "设置",
+        "Language": "语言",
+        "Open": "打开",
+        "Group": "组",
+        "Other": "其他",
+        "Read": "读取",
+        "Write": "写入",
+        "Execute": "执行",
+        "Rename": "重命名",
+        "enable": "开启",
+        "disable": "关闭",
+        "ErrorReporting": "上传错误报告",
+        "ShowHiddenFiles": "显示隐藏文件"
+      }
+    },
+    {
+      "name": "中文(繁體)",
+      "code": "tradch",
       "translation": {
         "AppName": "檔案管理器",
         "AppTitle": "檔案管理器",