Refs #35706 -- Prefixed 'Error:' to titles of admin pages with form errors.

This improves the screen reader experience.

tests/admin_changelist/tests.py

@@ -1264,6 +1264,24 @@ class ChangeListTests(TestCase):
             # Check only the first few characters since the UUID may have dashes.
             self.assertIn(str(a.pk)[:8], context.captured_queries[4]["sql"])
 
+    def test_list_editable_error_title(self):
+        a = Swallow.objects.create(origin="Swallow A", load=4, speed=1)
+        Swallow.objects.create(origin="Swallow B", load=2, speed=2)
+        data = {
+            "form-TOTAL_FORMS": "2",
+            "form-INITIAL_FORMS": "2",
+            "form-MIN_NUM_FORMS": "0",
+            "form-MAX_NUM_FORMS": "1000",
+            "form-0-uuid": str(a.pk),
+            "form-0-load": "invalid",
+            "_save": "Save",
+        }
+        superuser = self._create_superuser("superuser")
+        self.client.force_login(superuser)
+        changelist_url = reverse("admin:admin_changelist_swallow_changelist")
+        response = self.client.post(changelist_url, data=data)
+        self.assertContains(response, "Error: Select swallow to change")
+
     def test_deterministic_order_for_unordered_model(self):
         """
         The primary key is used in the ordering of the changelist's results to