Controller/Route for http://bdunagan.com/2014/09/01/rails-internationalization-at-scale/

missing_keys_controller.rb

# routes.rb
get '/missing_keys', :to => 'home#missing_keys'

# home_controller.rb
def missing_keys
  finder = MissingKeys.new(I18n.backend)
  @all_keys = finder.all_keys
  @missing_keys = finder.find_missing_keys
  @found_keys = @all_keys.collect { |key| key unless @missing_keys.keys.include?(key) }.compact

  # Reset locale.
  set_locale()
end