Meta: link Simplified Chinese translation

Fixes #1501.

Author: JinDX

index.bs

@@ -7,6 +7,7 @@ Text Macro: LATESTRD 2025-03
 Abstract: This standard defines an interface definition language, Web IDL, that can be used to describe interfaces that
 Abstract: are intended to be implemented in web browsers.
 Translation: ja https://triple-underscore.github.io/WebIDL-ja.html
+Translation: zh-Hans https://htmlspecs.com/webidl/
 Complain About: accidental-2119 no
 </pre>