Microsoft Graph API : Calendar private event not shown with user locale language

Hello,

We use Microsoft Graph API to manage events in Outlook calendars.

When creating an new event with sensitivity PRIVATE for a user account A, and try to view it from user B Outlook, this private event always appears with English description "Private Event" instead of a French description "Rendez-vous privé" as it used to be with EWS before we migrated to MS Graph.

How can we set a public description/summary in French for a private event with MS Graph ?