Fixed #22857 -- Reset translations when only .mo file changed

No need to restart the server when a translation file changes.
Refs #9523. Thanks artscoop for the report and Tim Graham for
the review.
Fixed typo in parameter name doc for BaseCommand.check().
Fixed copy/paste typos in StreamingHttpResponse doc.
Fixed and enhanced new HTML form docs.
Fixed #22894 -- Made admin add related/raw ID fields widgets customizable.

Decoupled behavior and style from the RelatedFieldWidgetWrapper and
ForeignKeyRawIdWidget.
Added newline to fix flake8 error.
Fixed #22912 -- Warned about a common mistake in tutorial 5.
Fixed #22917 -- Fixed typo in AlterIndexTogether.describe().
Fixed #16184 -- Fixed multiple PostGIS types introspection

Thanks radim.blazek@gmail.com for the report and initial patch.
Testing is tricky, as the failure condition is a bit of an edge
case. inspectapp.InspectDbTests should at least guarantee non
regression.
Fixed a flake8 warning