Respecting users language when formatting dates

[odzhychko]

When formatting dates the users locale setting is used but not the language.

Proposed change

Keep using users locale to determine date formats.
But use the users language for translating the words (month and weekday names) in the formatted date.

Example

• Given
  • User language "German"
  • User locale "English"
  • Date '2026-03-02'
• When
• Formatting date equivalent to Intl.DateTimeFormat(.., { dateStyle: 'full'})
• Then (currently)
  • Resulted is Monday, March 2, 2026
• Then (with proposed change)
  • Resulted is Montag, März 2, 2026

Note the result is not 'Montag, 2. März 2026' which would be the German format for { dateStyle: 'full'}.
Montag, März 2, 2026 is still the English format but with German words.

Affect components

• NcDateTimePicker
  • uses date-fns for formatting
• NcDateTime
  • use useFormatTime
    • uses Intl.DateTime

Background

Review comment #8644 (comment)