def all_keys
      I18n.backend.send(:translations).collect do |_check_locale, translations|
        collect_keys([], translations).sort
      end.flatten.uniq
    end
def all_keys
      I18n.backend.send(:translations).collect do |_check_locale, translations|
        collect_keys([], translations).sort
      end.flatten.uniq
    end
Returns an array with all keys from all locales