Hegemony of colonial languages

How does the field of postcolonial studies contribute to the linguistic, cultural or institutional dominance of English? What kinds of texts, discourses or practices elude, or are repressed by, this framework? What "blind spots" are revealed in postcolonial theory from the perspective of texts or traditions not in a colonizers language? What ideological or strategic roles do specific languages play in texts, institutional contexts, politics, or history?