Who decides on the final form of the ballot text?

Constitution of the Republic of Palau (1979) http://www.palauembassy.com/Documents/ConstitutionE.pdf

Section 1. Anamendment to this Constitution may be proposed by a Constitutional Convention,popular initiative, or by the Olbiil Era Kelulau, as provided herein:

(a) at leastonce every fifteen (15) years, the Olbiil Era Kelulau may submit to the votersthe question: “Shall there be a Convention to revise or amend theConstitution?”. If a majority of the votescast upon the question is in the affirmative, a Constitution Convention shallbe convened within six (6) months thereafter, in a manner prescribed by law;