I didn't think we were supposed to list anything in any other language but English, since Etsy has always been that way. I heard it straight from Etsy themselves only a few months ago, unless it's changed all of a sudden.
And it is harsh to correct someone that way. No harm was done at all, was it? She may have made a mistake, but if she hadn't she'd have a right to speak out about it. It would hardly be fair to play by the rules and then have others come in and dance all over them - that's obviously not what happened here, but if I saw someone that was doing that, I'd say so, too!