First you will need the i18n gem, which handles the internationalisation of text strings and objects

require 'i18n'
require 'i18n/backend/fallbacks'

Now you will need to configure the I18n module so that it falls back to the default locale, and loads the translations from the locales directory

    configure
        I18n::Backend::Simple.send(:include, I18n::Backend::Fallbacks)
        I18n.load_path, Dir[File.join(settings.root, 'locales', '*.yml')]
        I18n.backend.load_translations
    end