Because there is no such thing as "African Language".
Africa is a continent that contains 54 countries and more than 2100 completely different languages. Some estimates place the number of languages at around 3000.
The most prominent languages spoken in Africa are:
Afrikaans
Amharic
Arabic
English
French
Fula
Hausa
Igbo
Oroma
Somali
Swahili
Yoruba
Zulu
African drama in English may be written to reach a wider international audience, due to the global prominence of the English language. Additionally, English may be used as a way to challenge colonial legacies and reclaim the language for African storytelling. Lastly, some African playwrights may choose to write in English due to personal preference or proficiency in the language.
Kate Dorney has written: 'The changing language of modern English drama, 1945-2005' -- subject(s): Style, Theater, Linguistics in literature, English drama, History and criticism, English language, History
Rajesh Gopie has written: 'Out of bounds' -- subject(s): Drama, South African drama (English), East Indians
Michael Etherton has written: 'The development of African drama' -- subject(s): African drama (English), History, History and criticism, Theater 'Proceedings of the Tra Vinh Vietnam Aid Management and Coordination Seminar'
Governor General's Award for English-language drama was created in 1981.
Otto Reinert has written: 'Classic through modern drama' -- subject(s): Collections, Drama 'Working with prose' -- subject(s): American literature, English language, Rhetoric 'Drama' -- subject(s): Collections, Drama
Richard A. Via has written: 'English in three acts' -- subject(s): Drama in education, English language, Foreign speakers, Study and teaching
Samuel Lieberman has written: 'Roman drama' -- subject(s): Drama, Latin drama, Scripts, English drama, Translations into English, Translations
Suzanne Blow has written: 'Rhetoric in the plays of Thomas Dekker' -- subject(s): Drama, English language, Rhetoric, Technique
Thomas Dogget has written: 'The country-wake' -- subject(s): English drama, English drama (Comedy)
Walter Parker Bowman has written: 'Theatre language, a dictionary of terms in English of the drama and stage from medieval to modern times'
Moussa Jaffar Alsoudani has written: 'Modern English poetic drama as an antinaturalistic movement' -- subject(s): English Verse drama, English drama, History and criticism
Dawn Duncan has written: 'Language and identity in post-1800 Irish drama' -- subject(s): English drama, History and criticism, Irish authors, Nationalism in literature, Identity (Psychology) in literature