Require Transcription instances on create_transcriptions

The CreateTranscriptions helper does not require a list of Transcription while the CreateTranscription one does. We need to stay consistent.

changed milestone to %ML Prod - November 2022 n°2

added P3 Quick Win labels

assigned to @schneider-y

changed milestone to %ML Prod - Next

unassigned @schneider-y

changed milestone to %ML Prod - December 2022 n°2

changed milestone to %ML Prod - Next

changed milestone to %0.3.6

changed milestone to %0.3.7

assigned to @ebardou

closed