fix(date): return narrow format of weekday

[prashantsinghb]

fixes #17959

Description

Update i18n code to return narrow format of weekday.

Markup:

<template>
  <v-app>
    <v-container>
      <v-locale-provider locale="vi">
        <v-date-picker
          @update:model-value="handleUpdate"
          hide-actions
        ></v-date-picker>
      </v-locale-provider>
    </v-container>
  </v-app>
</template>

<script setup>
  import { toRaw } from 'vue'

  const handleUpdate = newValue => {
    console.log(toRaw(newValue))
  }
</script>