CHAPTER IV
HUMAN RIGHTS
42. Arrest, detention and fair trial
(2) Every person arrested for, or accused of, the alleged commission of an offence shall, in addition to the rights which he or she has as a detained person, have the right —
(f) as an accused person, to a fair trial, which shall include the right —
(ix) to be tried in a language which he or she understands or, failing this, to have the proceedings interpreted to him or her, at the expense of the State, into a language which he or she understands ;
Rights during trial - interpretation and translation
EDIT.