Possible Clues:

• Language of a greeting given to Liberal in Westminster
• Greeting in law, one's bad language
• E. African language
• It's heard in Tanzania
• Language originating in South West Africa has important linguistic implications
• Language giving us bwana, safari
• Common language of E. Africa
• Was confused with Healy, by the sound of it, in a manner of speaking
• An official language spoken in 15
• African language hard to detect in lament in Spanish certainly