Renamed Transifex project from django-core to django

See also http://blog.transifex.com/post/83622601443/new-teams-management-transifex
Fixed #22499 -- Fixed a typo in an admin_views test that caused failure on Oracle.
Fixed PEP8 errors in compilemessages
Fixed #22328 -- Added --exclude option to compilemessages

Added --exclude option to compilemessages to enable exclusion of
specific locales.
Added unit tests for --exclude option of compilemessages

Refs #22328
Added documentation for --exclude option of compilemessages

Refs #22328
Added myself to AUTHORS file
Added --exclude option to makemessages

Added --exclude option to makemessages to enable exclusion of
specific locales.

Refs #22328
Added unit tests for --exclude option of makemessages

Refs #22328
Added documentation for --exclude option of makemessages

Refs #22328