Change the calendar settings according to user's language setting
Regardless of the user's language setting, the calendar of the reservation screen uses the American format - week starts from Sunday.
Also the days are not indicated in the calendar (there is no top row with S - M - T- W - T- F- S)
The calendar format should change according to user's language preference (if other than US English, the week should start from Monday). At minimum, the calendar should have the days on the top.

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Gregory Jeames commented
While you're working on the calendar control (in Web Central), could you review it so it is easier to use the down and up arrow to change the year?
At the moment, they are too small and users find it difficult to change year. -
Thomas Fastenakel commented
This was fixed for some Workplace views in recent versions but not everywhere (e.g. with the new Calendar view in V2022.02 first day of week is still Sunday even though we are using a French locale)
Also weekdays initials are still from English