Fixed typo in exception message; refs #19414

Thanks Alexey Boriskin for the report.

django/contrib/admin/decorators.py

@@ -20,7 +20,7 @@ def register(*models, **kwargs):
             raise ValueError('site must subclass AdminSite')
 
         if not issubclass(admin_class, ModelAdmin):
-            raise ValueError('Wrapped class must sublcass ModelAdmin.')
+            raise ValueError('Wrapped class must subclass ModelAdmin.')
 
         admin_site.register(models, admin_class=admin_class)
 

tests/admin_registration/tests.py

@@ -115,7 +115,7 @@ class TestRegistrationDecorator(TestCase):
         )
 
     def test_wrapped_class_not_a_model_admin(self):
-        self.assertRaisesMessage(ValueError, 'Wrapped class must sublcass ModelAdmin.',
+        self.assertRaisesMessage(ValueError, 'Wrapped class must subclass ModelAdmin.',
             register(Person), CustomSite)
 
     def test_custom_site_not_an_admin_site(self):