Who decides on the final form of the ballot text?

Provisional constitution, 2012, http://www.constitutionnet.org/files/adopted_provisional_constitution_som_03092012.pdf

Article 141. Referendums(2) The authority conducting a referendum shall ensure that: (a) The referendum asks a question clearly, in a manner designed to elicit the genuine view of the voter and does not obscure the nature of the choice that the voter faces; and (b) That neither a question, the design of the ballot paper nor the procedure suggests a particular answer to the question.

No provision was found in this regard, however the legislation does state that 'the authority conducting a referendum' shall deal with these matters.