apps.core.models.deadline: Forgot to add update DeadlineManager.smart_create.

in b16c6d4f1c18d0f459205b53e05f3b3a96df7398.
apps.core.models.deadline: Fixed DeadlineManager.smart_create argument forwarding.
devilry_examiner...add_deadline: give_another_chance instead of initial_text.
devilry_examiner...add_deadline: Spelling fix.