CHAPTER III
PROTECTION OF FUNDAMENTAL RIGHTS AND FREEDOMS OF THE INDIVIDUAL
Article 19
Protection from arbitrary arrest or detention.
(5) Where a person is detained by virtue of such a law as is referred to in Article 29 of this Constitution, the following provisions shall apply —
(a) he shall, as soon as reasonably practicable and in any case not more than five days after the commencement of his detention, be furnished with a statement in writing, in a language that he understands, of the grounds upon which he is detained;
Language
Fair trial standards
Rights during investigation - informed of belief that crime has been committed
Rights during trial - interpretation and translation
EDIT.