fix: fix a issue which markdown component can render meta tag problem

which can be xss script code by malicious messages

Author: moonrailgun

client/shared/i18n/langs/en-US/translation.json

@@ -396,6 +396,7 @@
   "ke3d797fd": "Drop files to send into current converse",
   "ke59ffe49": "Muted, there are {{remain}} left",
   "ke6da074f": "The message was withdrawn successfully",
+  "ke9748e88": "Custom Meta is not supported",
   "keb053701": "Copy message text successfully",
   "kec46a57f": "Add members",
   "kecb51e2c": "Old password",

client/shared/i18n/langs/zh-CN/translation.json

@@ -396,6 +396,7 @@
   "ke3d797fd": "拖放文件以发送到当前会话",
   "ke59ffe49": "禁言中, 还剩 {{remain}}",
   "ke6da074f": "消息撤回成功",
+  "ke9748e88": "不支持自定义Meta",
   "keb053701": "复制消息文本成功",
   "kec46a57f": "添加成员",
   "kecb51e2c": "旧密码",

client/web/src/components/Markdown/render.tsx

@@ -45,6 +45,7 @@ export const Markdown: React.FC<{
         />
       ),
       style: () => <div>{t('不支持自定义样式')}</div>,
+      meta: () => <div>{t('不支持自定义Meta')}</div>,
     }),
     []
   );