Window.locale.

To access localized resources, use the Localizations.of() method
to access a specific localizations class that is provided by a given delegate.
Use the intl_translation package to extract translatable copy
to arb files for translating, and importing them back into the app
for using them with intl.

For further details on internationalization and localization in Flutter,
see the internationalization guide, which has sample code
with and without the intl package.

Managing dependencies

In iOS, you add dependencies with CocoaPods by adding to your Podfile.
Flutter uses Dart’s build system and the Pub package manager
to handle dependencies. The tools delegate the building of the
native Android and iOS wrapper apps to the
respective build systems.