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