Fixed #22242 -- Documented common cookie size limit.
Fixed #21991 -- Added warning regarding tests failure if locales not installed.

Thanks reidrac for the report.
Fixed #21860 -- Added to_field_name to ModelChoiceField docs.

Thanks Keryn Knight for the suggestion.
Fixed #22006 -- Documented how to write a login_required mixin for CBVs.

Thanks django at patjack.co.uk for the suggestion and mockforest
for the draft patch.
Fixed #21179 -- Added a StreamingHttpResponse example for CSV files.

Thanks charettes for the suggestion.
Amended login required mixin documentation to honor **initkwargs.
Merge commit 'cc5804bcab9e410a2c0fc2225fd0233bf8db0511'