[openstreetmap/openstreetmap-website] Add unsaved changes warning to message and diary forms (PR #7076)

[Nam Pham]

@phanq003 commented on this pull request.



> @@ -0,0 +1,48 @@
+(function () {
+  function beforeUnloadListener(event) {
+    event.preventDefault();
+    // Legacy support for older browsers.
+    event.returnValue = true;
+  };
+
+  // A function that adds a `beforeunload` listener if there are unsaved changes.

that comment specifically comes from the google chrome reference i used, the comments were mostly more for me than the codebase to be honest, it seems like the norm for this repo is no comments. What would be the best course of action (e.g. delete or change to jsdoc)

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