a fully featured localization / internationalization (i18n) library for Flutter

flutter_translate

Flutter Translate is a fully featured localization / internationalization (i18n) library for Flutter.

It lets you define translations for your content in different languages and switch between them easily.

Very easy to use
Mobile, Web and Desktop support
Pluralization and Duals support
Static keys support with flutter_translate_gen
Supports both languageCode (en) and languageCode_countryCode (en_US) locale formats
Automatically save & restore the selected locale with a simple implementation
Full support for right-to-left locales
Fallback locale support in case the system locale is unsupported
Supports both inline or nested JSON

Complete documentation is available on the wiki page.