Add the ability to customize weekday names

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Description

Hello! I noticed that, when I open the calendar with the pt-PT locale, the names of the weekdays are not abbreviated. As the available screen space in my application is limited, this causes the names to get cut-off.

I understand that this the intended behavior (as the standard JS Date#toLocaleDateString with { weekday: 'short' } also does not abbreviate), but I think it would be cool to have the ability to customize them.

Proposed solution

It looks like the react-calendar project already exposes some options for customizing the weekdays, but I don't see a way to do this using only the react-date-picker dependency.

https://github.com/wojtekmaj/react-calendar/blob/main/packages/react-calendar/src/Calendar.tsx props contains a formatShortWeekday function.

Alternatives

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Additional information

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