Hello @Helen285,
I haven't experienced that happening myself. I temporarily added another language version of my listing and this is how I deleted that.
Maybe that might work for you.
Click on "Host" and then on "Manage listings" in the menu. Then click on the "Manage listings" button for the listing concerned.
Then scroll down to the "Description" section and click on the "Edit" button for that.
If you now see both the English and Spanish language versions check if there's a little bin icon next to the title of your listing in Spanish.
If there is, click on that to delete the Spanish version and then click on "Save".
If that doesn't work you can contact Airbnb customer service.
Alternatively you could use Google translate to translate the messages and reply in English.
I've received requests in French and Japanese. I responded in English, accepted the requests and everything went well.
Steve.