Insert LocalizedModelChoiceField for use in MotionSetWorkflowMixin. Fixed #713.
Merge pull request #719 from normanjaeckel/TranslateWorkflow

Insert LocalizedModelChoiceField for use in MotionSetWorkflowMixin.
Fixes #721

Saving the anonymous user into a list of speakers.

Also raises an AttributeError if someone tries to save the anonymous user
into any person field.
Merge pull request #723 from ostcar/issue_721

Fixes #721