Three word "Day name"

[iBabu007]

Checklist

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Feature description

If possible then replaced the day names with three word like "Sun", "Mon".

Why do you want this feature?

I know nothing wrong in present naming. Actually sometimes I confused with sat and sun day😅.

If possible then please add this.

Additional information

^{Edited by @naveensingh to trigger image minimizer}

[LOUTFI94]

Hi ! As part of a open source software course at University Paris 8, me and @Bmarwane93 would like to work of this feature.

[Aga-C]

@LOUTFI94 Please read Contribution rules before starting any work.