CONSTITUTION OF BOTSWANA
CHAPTER II - Protection of Fundamental Rights and Freedoms of the Individual (ss 3-19)
10. Provisions to secure protection of law
(2) Every person who is charged with a criminal offence-
(b) shall be informed as soon as reasonably practicable, in a language that he or she understands and in detail, of the nature of the offence charged;
Rights during trial - informed promptly and in detail of charges
Rights during trial - interpretation and translation
EDIT.