chore(macros/WebExtExamples): add zh translations (#11377)

* chore(macros/WebExtExamples): add l10-zh translation for WebExtExample

* Apply suggestions from code review

Co-authored-by: A1lo <[email protected]>

---------

Co-authored-by: A1lo <[email protected]>

Author: jasonren0403

Diff for: kumascript/macros/WebExtExamples.ejs

@@ -25,7 +25,9 @@ const examplesBaseURL = "https://github.com/mdn/webextensions-examples/tree/main
 const desiredHeading = $0 || "h3";
 
 const s_example_addons = mdn.localString({
-    "en-US": "Example extensions"
+    "en-US": "Example extensions",
+    "zh-CN": "示例扩展",
+    "zh-TW": "範例擴充套件",
 });
 
 /*