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@arunky suggestion worked perfectly first time after I downloaded the languages on Settings -> Translate. However, whenever I launch the app a couple of days later, I get the same error message. I've rechecked going to Settings -> Translate: the downloaded languages are still there and the on-device mode toggle is still on. After a while (not that short, can be more than 1 minute), looks to work again. Still, this is unmanageable to get a user-facing app: what should I tell them? Keep trying until the error goes away?

Wonderful! I agree this should be added to the documentation link