Custom AppLocalization class for localization

AppLocalizations.dart

import 'package:flutter/material.dart';
import 'package:intl/intl.dart';

class AppLocalization {
  
  static Future<AppLocalization> load(Locale locale) {
    final String name = locale.countryCode.isEmpty ? locale.languageCode : locale.toString();
    final String localeName = Intl.canonicalizedLocale(name);
    return initializeMessages(localeName).then((_) {
      Intl.defaultLocale = localeName;
      return AppLocalization();
    });
  }

  static AppLocalization of(BuildContext context) {
    return Localizations.of<AppLocalization>(context, AppLocalization);
  }
  
  // list of locales
  String get heyWorld {
    return Intl.message(
      'Hey World',
      name: 'heyWorld',
      desc: 'Simpel word for greeting ',
    );
  }
}