Arguably there is no "true" translation; the point of JW capturing what spectrum it does, is to reveal features obscured or invisible in the visible spectrum.
Over the years I have come to reject the "what would the plain eye see" position as not helpful. We're tool-using monkeys and the phones we carry around now run supercomputers to quietly show not what the plain eye sees but something which works better for our needs—to be both evocative and information-rich.
If and when we ever get a chance to gaze on Uranus ourselves, I myself imagine and hope it will be courtesy of some transformation of our embodiment that will look an order richer than even the most stylized images we have today, because they will be broad spectrum and be overlayed with semantic content rendered as perceptual to aid our executive functions... all of which will probably be running on some computation substrate other than our monkey mammal selves. Space isn't kind to those.