Translate the following English sentence to French:
"However, we cannot tolerate international agreements of this kind being used by certain groups in Belgium to their advantage in order to undermine the language legislation which guarantees the tolerant co-existence of the three language communities" ."
Nous ne pouvons toutefois tolérer que certains groupes violent ces conventions internationales en Belgique en vue de remettre en question la législation linguistique qui garantit la cohabitation de trois communautés dans un esprit de tolérance."