fix: add "Other" menu, for e.g. integration system links

tests/web/test_menus.py

@@ -9,4 +9,12 @@ class TestSideshowMenuHandler(WebTestCase):
     def test_make_menus(self):
         handler = mod.SideshowMenuHandler(self.config)
         menus = handler.make_menus(self.request)
-        self.assertEqual(len(menus), 5)
+        titles = [menu['title'] for menu in menus]
+        self.assertEqual(titles, [
+            'Orders',
+            'Customers',
+            'Products',
+            'Batches',
+            'Other',
+            'Admin',
+        ])