translate English to French: Both sides agreed ad referendum to a cost-sharing agreement in which the host country would bear 60 per cent of the cost while the Tribunal would take 40 per cent as its share.
Les deux parties ont conclu un accord ad referendum de partage des coûts aux termes duquel le pays hôte assumerait 60 % des coûts et le Tribunal y contribuerait à hauteur de 40 %.