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thomblake comments on Bayes Slays Goodman's Grue - Less Wrong Discussion
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Right, they would, if for weird historical reasons they also thought of "grue" and "bleen" as reasonable linguistic primitives. So the human scientists would be surprised when the next emerald turned out to be bleen rather than grue, and they'd be able to observe that the shift happened at time T, and thus observe that green is a natural property. So this isn't really much of a problem.
That's not completely satisfying in that one wants an induction scheme that assigns priors independent of linguistic accident. If one tries to make hypotheses simplicity depend on language then one quickly gets very complicated hypotheses being labeled as simple (e.g. "God").