Putting these lines in a custom data selection will produce the desired dates in English and French. I couldn't find an online repository so I can link my screenshots to you, so I can only give you the below tips.
=@FormatDate(Date(false),'YYYY-MM-DD')
=@FormatDateF(Date(false),'YYYY-MM-DD')
The order for the functions should be:
-NormalizeDate
-GetDayName
-GetMonthName
-GetDayNameF
-GetMonthNameF
-FormatDate
-FormatDateF
Open each one starting from the top, and simply click ok, so they are "loaded" properly, otherwise you might get errors trying to call them.