Needs plural support. Same for Toolserver:catdown-scaling-height/en, Toolserver:catdown-scaling-both/en.
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Quite a silly preference, but Done for Catdown-scaling-width and Catdown-scaling-height. Not done for catdown-scaling-both as I don't see how could you make it agree tiwh the two numeric parameters (in any case, I also added parsemag for that call).