Revert error messages.

tests/test_bound_fields.py

@@ -39,7 +39,7 @@ class ExampleSerializer(serializers.Serializer):
         serializer.is_valid()
 
         assert serializer['text'].value == 'x' * 1000
-        assert serializer['text'].errors == ['Ensure this value has at most 100 characters (it has 1000).']
+        assert serializer['text'].errors == ['Ensure this field has no more than 100 characters.']
         assert serializer['text'].name == 'text'
         assert serializer['amount'].value is 123
         assert serializer['amount'].errors is None

tests/test_generics.py

@@ -154,7 +154,7 @@ def test_post_error_root_view(self):
         data = {'text': 'foobar' * 100}
         request = factory.post('/', data, HTTP_ACCEPT='text/html')
         response = self.view(request).render()
-        expected_error = '<span class="help-block">Ensure this value has at most 100 characters (it has 600).</span>'
+        expected_error = '<span class="help-block">Ensure this field has no more than 100 characters.</span>'
         self.assertIn(expected_error, response.rendered_content.decode('utf-8'))
 
 
@@ -301,7 +301,7 @@ def test_put_error_instance_view(self):
         data = {'text': 'foobar' * 100}
         request = factory.put('/', data, HTTP_ACCEPT='text/html')
         response = self.view(request, pk=1).render()
-        expected_error = '<span class="help-block">Ensure this value has at most 100 characters (it has 600).</span>'
+        expected_error = '<span class="help-block">Ensure this field has no more than 100 characters.</span>'
         self.assertIn(expected_error, response.rendered_content.decode('utf-8'))