Able to translate the widget into different language

Is it possible to translate the widget Birth date from french to english ? (sub labels and its months)

Thank you

That's not possible as of the moment but I have escalated this as a feature request. Once this is implemented you will be informed here.

For now, you may consider using the Localized Calendar Widget which has built-in language option or the regular Date Picker field which you can translate in the Translation tool.