Thanks Tom Aratyn for the report.

English words aren't removed if non-ASCII chars are present.

Fixed by 9ec7d8e5.

Thanks Fraser Nevett for the report and Tim Graham for patch edits.

Thanks Ramin Farajpour Cami for the report.

This will be a more useful regression test after refs #27515.

Thanks to Rachel Tobin for the initial __qualname__ work and tests.

As per c651331b.

Regression in ec50937b.

Thanks Simon Charette for review.

Using lowercased model class names suggested that accessing the attribute
from instances of the class returned an instance of the descriptor, but
this is only the case when accessed from the model class.

Setting __qualname__ is sufficient for pickling of DoesNotExist and
and MultipleObjectsReturned to work correctly.