CHAPTER IV
Fundamental Rights and Freedoms of the Individual
34. Protection from arbitrary arrest or detention.
(2) Any person who is arrested or detained shall be informed at the time of his arrest or detention, in a language that he understands, of the reasons for his arrest or detention:
Provided that if an interpreter is necessary and is not readily available or if it is otherwise impracticable to comply with the provisions of this sub-article at the time of the person’s arrest or detention, such provisions shall be complied with as soon as practicable.
Language
Rights during investigation - access to interpreter and translation if questioned in other language
EDIT.