Rails helper to show translation keys on the page

application_helper.rb

module ApplicationHelper
  # Add ?show_translation_keys=1 to URLs to let your team members
  # know the name of the translation keys beeing used on the current
  # page.
  def t(key, options = {})
    if params[:show_translation_keys]
      scope_key_by_partial(key)
    else
      super
    end
  end
end