code: public static Locale setLoggingLocale( Locale locale ) {
          return LOGGING_LOCALE.getAndSet(locale != null ? locale : Locale.getDefault());
      }
docs: Set the locale used for the logs. This should be used when the logs are to be written is a specific locale, independent of
  the {@link Locale#getDefault() default locale}. To use the default locale, call this method with a null value.
  
  @param locale the desired locale to use for the logs, or null if the system locale should be used
  @return the previous locale
  @see #getLoggingLocale()