You should consider filtering by input language. Showing the same Wikipedia article in different languages is not helpful when I am searching in English. Also you may unify by entries by URL, it shows the same URL, just with different publish dates, which is interesting and might be useful, but should maybe be behind a toggle, as it is confusing at first.
Great feedback, agree I need to filter here. Some website localization is very hard to work around, because they will try to geo-locate the IP address of your bot and redirect it accordingly to a given language...