devilry_examiner...close_groups: Corrected title.
apps.core.models.assignment_group: Added add_nonelectronic_delivery() to

the manager.
devilry_examiner.views.add_nonelectronic_delivery: Usable.
devilry_examiner...add_nonelectronic_delivery: Explain when to use.
devilry_examiner: Translations for add non-electronic deliveries.