initialize method
Implementation
Future<bool>? initialize([String? Function()? preferredLocale]) {
if (_initialized != null) return _initialized;
var locale = preferredLocale != null ? preferredLocale() : null;
if (locale == null) {
print('defineLocaleFromSystem()');
locale = defineLocaleFromSystem()!;
print('System locale: $locale');
}
_initialized = _defineLocale(locale);
return _initialized;
}