CHAPTER 2 - BILL OF RIGHTS
Access to courts and tribunals
SECTION 15
(6) Every person charged with an offence, every party to civil proceedings, and every witness in criminal or civil proceedings has the right to give evidence and to be questioned in a language that he or she understands.
(7) Every person charged with an offence and every party to civil proceedings has the right to follow the proceedings in a language that he or she understands.
(8) To give effect to the rights referred to in subsections (6) and (7), the court or tribunal concerned must, when the interests of justice so require, provide, without cost to the person concerned, the services of an interpreter or of a person competent in sign language.
Language
Rights during investigation - access to interpreter and translation if questioned in other language
Rights during trial - interpretation and translation
EDIT.