LAW on the Implementation of the Statute of the International Criminal Court and the Prosecution of Crimes against International Law of War and Humanitarian Law
GENERAL PROVISIONS
Article 5
(1) unless otherwise decided by Government of the Republic of Croatia, the state authorities shall communicate with the International Criminal Court through the Government of the Republic of Croatia in the Croatian language or in one of the official languages of the International Criminal Court.
Language
Language of requests for cooperation
EDIT.