Rosette is a Ruby on Rails engine that helps you add missing translations to your application.

If your main app is configured to raise on missing translations, Rosette will catch any I18n::MissingTranslationData error and display a form to add the missing translations.

The form includes an input for each available locale set by config.i18n.available_locales.

Add this line to your application's Gemfile:

gem "rosette"

And then execute:

$ bundle

Make sure your app raises error for missing translations in development:

# config/environments/development.rb

config.i18n.raise_on_missing_translations = true

and that you explicitly set the available locales:

# config/application.rb

config.i18n.available_locales = [:fr, :en]

Whether you currently use or are interested in starting to use i18n-task to normalize your locales files, add this initializer:

# config/initializers/rosette.rb

Rosette.normalize = true

This is how you will be able to add your missing translations for each available locale set in config/application.rb:

This gem also provides a command line interface. Run bundle exec rosette to get the list of all the tasks:

The gem is available as open source under the terms of the MIT License.