Opt-out for video recording of talks
Adjust redording message on poster session
Update translation
flip abstract and description in submission forms
Move accept-recording label to parent form
Merge branch 'develop' into fix/submission-forms

Conflicts:
	pyconde/proposals/forms.py
Remove a/v recording from poster submission form
Merge pull request #28 from EuroPython/fix/submission-forms

Fixes EP-329, refers EP-342