Who decides on the final form of the ballot text?

Niue
Answer
The format of the question is defined by law
Source
Constitutional Polls Act 1977
(adopted in 1977)
http://www.paclii.org/nu/legis/consol_act/cpa1977268/
Section 2(3). The question shall be submitted in the form in the Schedule.
Schedule– Voting Paper section 2(3) Constitutional Amendment Poll (article 35 Niue Constitution)
(adopted 1977)