要本地化jitsi_meet_flutter包，您需要按照以下步骤进行操作：

1. 在项目的lib文件夹中创建一个新文件夹，命名为l10n（本地化）。
2. 在l10n文件夹中创建一个新文件，命名为app_localizations.dart。此文件将包含所有本地化字符串和翻译。
3. 在app_localizations.dart文件中添加以下代码：

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

class AppLocalizations {
  static Future 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 AppLocalizations();
    });
  }

  static AppLocalizations of(BuildContext context) {
    return Localizations.of(context, AppLocalizations);
  }

  String get hello {
    return Intl.message(
      'Hello',
      name: 'hello',
      desc: 'Greeting',
    );
  }

  // Add more localized strings here

  // Example of a parameterized string
  String greet(String name) {
    return Intl.message(
      'Hello, $name',
      name: 'greet',
      desc: 'Greeting with name',
      args: [name],
    );
  }
}

class AppLocalizationsDelegate extends LocalizationsDelegate {
  const AppLocalizationsDelegate();

  @override
  bool isSupported(Locale locale) => ['en', 'zh'].contains(locale.languageCode);

  @override
  Future load(Locale locale) => AppLocalizations.load(locale);

  @override
  bool shouldReload(AppLocalizationsDelegate old) => false;
}

4. 在main.dart文件中添加以下代码：

import 'package:flutter/material.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:jitsi_meet/jitsi_meet.dart';
import 'package:your_project_name/l10n/app_localizations.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Jitsi Meet',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      localizationsDelegates: [
        AppLocalizationsDelegate(), // Add this line
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
      ],
      supportedLocales: [
        const Locale('en', ''), // English
        const Locale('zh', ''), // Chinese
      ],
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final AppLocalizations localizations = AppLocalizations.of(context);

    return Scaffold(
      appBar: AppBar(
        title: Text(localizations.hello),
      ),
      body: Center(
        child: Text(localizations.greet('John')),
      ),
    );
  }
}

5. 更新pubspec.yaml文件，添加以下依赖项：

dependencies:
  flutter:
    sdk: flutter
  jitsi_meet_flutter: ^2.2.0

dev_dependencies:
  flutter_localizations:
    sdk: flutter
  intl: ^0.17.0

6. 运行flutter packages get命令以获取新的依赖项。
7. 运行您的Flutter应用程序，现在您应该能够看到本地化的字符串。您可以在app_localizations.dart文件中添加更多本地化字符串，并在应用程序的其他部分使用它们。

这是一个基本的示例，您可以根据自己的需求定制和扩展本地化功能。