radio program now with teaser and/or descrption as well as references to
internal/external websites/email

generated with cmd:
python3 manage.py dumpdata --settings=lohrothek.local_settings
--settings=lohrothek.settings --indent 4 program.RadioProgram
program.RadioProgramReference program.BroadcastTemplate
program.BroadcastRepeatTemplate > scripts/program_fixture.json

apply with cmd:
python3 manage.py loaddata scripts/program_fixture.json