[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.

Removed!

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