# File lib/gettext_i18n_rails/backend.rb, line 48
    def interpolate(string, values)
      if string.respond_to?(:%)
        reserved_keys = if defined?(I18n::RESERVED_KEYS) # rails 3+
          I18n::RESERVED_KEYS
        else
          I18n::Backend::Base::RESERVED_KEYS
        end

        string % values.except(*reserved_keys)
      else
        string
      end
    end