The clean-orphaned-data command had two bugs, one of which was bad.

The query for orphaned change descriptions was picking up change

   descriptions which were part of active drafts.
The help string was wrapped in gettext_lazy, which was causing a

   crash when trying to use --help because argparse doesn't understand a

   django lazy object. Our other commands use regular gettext for

   those, so I've changed it here. The invalidate-api-tokens command

   had the same problem.

Was able to use manage.py clean-orphaned-data --help
Verified that clean-orphaned-data was no longer picking up any

  objects which were still connected to active drafts.