Now, we have all the messages separated from the UI and we are ready for translation. We need to extract them from the source code into the external file with a special program called extract_to_arb.dart from the intl package, as shown in the following code:
pub run intl:extract_to_arb --output-dir=web web/registration_form.dart
The preceding program generates the intl_messages.arb file inside the specified web directory. This file contains all the messages in the ARB format. ARB is a localization resource format based on JSON. This format provides the following benefits:
Simplicity: This format is simple and human-readable because it is based on JSON
Extensibility: In this format, vocabulary can be added without affecting the existing tools and usage
Direct usability: Applications can access the resource directly from this format without converting them to another form
You can find more about the ARB format in the specification available at https://code.google.com/p/arb...