My guess is something Slavic (since Slavic languages lack articles apart from Sorbian). I could be wrong. I don't think Finno-Ugric languages have them either. That's just Europe, there are plenty of such examples elsewhere — Japanese has tonnes of suffixes but no direct equivalent to this?
(Whether Hungarian qualifies as Finno-Ugric is up for debate, but Hungarian most definitely has determinate and indeterminate articles.)
> since Slavic languages lack articles apart from Sorbian
As far as I know (and as confirmed by Wikipedia [1]), Sorbian does not have articles. Maybe you are thinking of Bulgarian, which does have articles (although the definite article attaches as a suffix to the noun, rather than being an independent word).
[1] https://en.wikipedia.org/wiki/Sorbian_languages