Only available on mobile, huh? Reminds me of Google Translate on photos/images, which has been available for years on mobile but never on web. I hope this doesn't become a trend.
I mean I recognize that Translate on images in the browser - especially if combined with Youtube and Image Search - would be incredibly powerful, but it just wouldn't be as much a thing on desktop.
I'm pretty sure (don't quote me on this) that there's a bit of processing done on the device (character recognition / isolation) before sending it off to Translate as well; not sure how well that would port to a browser. Should work just fine with wasm though.