Added to the list of presets in the README [0]. Thanks!

[0] https://github.com/abetusk/neatocal?tab=readme-ov-file#prese...

It would be trivial to allow all possible languages with toLocaleString[0]:

  d = new Date();
  console.log(d.toLocaleString(window.navigator.language, {
    weekday: 'short'
  }));