Under my property managers listing for our Villa in Bali when we search from Australia (no where else) the listing comes up in Spanish. This listing was fine several months ago. The only changes that occurred was we upload new photos. We haven't had any bookings from air bnb for months.
Sorry to hear you're having some issues with your listing appearing in Spanish. I tried to locate your Airbnb profile, however it's only showing your guest account. Do you have another account you host your listing from?