Article 15
2. Any person who is arrested or detained shall be informed as soon as reasonably practicable, in a language which he understands, of the reasons for his arrest or detention.
Article 20
6. Every person who is charged with a criminal offence
(a) shall be informed as soon as reasonably practicable, in a language which he understands, of the nature of the offence charged;...
(e) shall be permitted to have without payment the assistance of an interpreter if he cannot understand the English language.