This is a bilingual Kirundi/French coin. The texts are paired:
ubumwe ibikorwa amajambere
unité travail progrès
both mean Unity Work Progress
iBanki ya Republika y'uBurundi
Banque de la République du Burundi
both mean Bank of the Republic of Burundi, and
Amafranga
Francs
Are both plural, of ifranga and franc respectively.
With thanks to Harald and his eminent
web sitePeter