Flutterの多言語対応のサンプルプロジェクト
Internationalizing Flutter apps | Flutter https://flutter.dev/docs/development/accessibility-and-localization/internationalization
中級編6:多言語対応(Localization)｜Flutter実践入門 ～環境構築からAndroid/iOS/Webに広告を付けて同時にリリース!!～ https://zenn.dev/kazutxt/books/flutter_practice_introduction/viewer/intermediate_localization#%E5%A4%9A%E8%A8%80%E8%AA%9E%E5%AF%BE%E5%BF%9C
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