docs: def setup_locale(lc_all: str,
                   first_weekday: int = None,
                   *,
                   lc_collate: str = None,
                   lc_ctype: str = None,
                   lc_messages: str = None,
                   lc_monetary: str = None,
                   lc_numeric: str = None,
                   lc_time: str = None) -> str:
      """Shortcut helper to setup locale for backend application.
  
      :param lc_all: Locale to use.
      :param first_weekday:
          Weekday for start week. 0 for Monday, 6 for Sunday. By default: None
      :param lc_collate: Collate locale to use. By default: ``<lc_all>``
      :param lc_ctype: Ctype locale to use. By default: ``<lc_all>``
      :param lc_messages: Messages locale to use. By default: ``<lc_all>``
      :param lc_monetary: Monetary locale to use. By default: ``<lc_all>``
      :param lc_numeric: Numeric locale to use. By default: ``<lc_all>``
      :param lc_time: Time locale to use. By default: ``<lc_all>``
      """
      if first_weekday is not None:
          calendar.setfirstweekday(first_weekday)
  
      locale.setlocale(locale.LC_COLLATE, lc_collate or lc_all)
      locale.setlocale(locale.LC_CTYPE, lc_ctype or lc_all)
      locale.setlocale(locale.LC_MESSAGES, lc_messages or lc_all)
      locale.setlocale(locale.LC_MONETARY, lc_monetary or lc_all)
      locale.setlocale(locale.LC_NUMERIC, lc_numeric or lc_all)
      locale.setlocale(locale.LC_TIME, lc_time or lc_all)
  
      return locale.setlocale(locale.LC_ALL, lc_all)