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.

tinyfilemanager.php

@@ -1088,7 +1088,7 @@ if (isset($_GET['settings']) && !FM_READONLY) {
                     }
                     ?>
                     <div class="form-group row">
-                        <label for="js-err-rpt-1" class="col-sm-3 col-form-label">Error Reporting</label>
+                        <label for="js-err-rpt-1" class="col-sm-3 col-form-label"><?php echo lng('ErrorReporting') ?></label>
                         <div class="col-sm-9">
                             <div class="btn-group btn-group-toggle" data-toggle="buttons">
                                 <label class="btn btn-secondary <?php echo getChecked($report_errors, 1, 'active') ?>">
@@ -1102,7 +1102,7 @@ if (isset($_GET['settings']) && !FM_READONLY) {
                     </div>
 
                     <div class="form-group row">
-                        <label for="js-hdn-1" class="col-sm-3 col-form-label">Show Hidden Files</label>
+                        <label for="js-hdn-1" class="col-sm-3 col-form-label"><?php echo lng('ShowHiddenFiles') ?></label>
                         <div class="col-sm-9">
                             <div class="btn-group btn-group-toggle" data-toggle="buttons">
                                 <label class="btn btn-secondary <?php echo getChecked($show_hidden_files, 1, 'active') ?>">
@@ -3372,6 +3372,7 @@ function lng($txt) {
     $tr['en']['Move']           = 'Move';                   $tr['en']['Change']             = 'Change';
     $tr['en']['Settings']       = 'Settings';               $tr['en']['Language']           = 'Language';
     $tr['en']['MemoryUsed']     = 'Memory used';            $tr['en']['PartitionSize']      = 'Partition size';
+    $tr['en']['ErrorReporting'] = 'Error Reporting';        $tr['en']['ShowHiddenFiles']    = 'Show Hidden Files';
 
     $i18n = fm_get_translations($tr);
     $tr = $i18n ? $i18n : $tr;

translation.json

@@ -351,8 +351,74 @@
       }
     },
     {
-      "name": "中文",
+      "name": "中文(简体)",
-      "code": "ch",
+      "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",