[#48721647] Allow adding questions without options to a finalized survey.
[#48721615] Allow editing a question's content from the UI for a finalised survey.
[#48721647] A newly added question (to a finalised survey) has all its fields disabled except content.
[#48721647] Don't allow creating a mandatory question for a finalised survey.
[#48721647] Confirm before adding questions to a finalized survey.
[#48721683] Confirm before adding an option to a finalised survey.