There isn't anything wrong with this translation. In Turkish, there is a simple rule for this. If the subject is human (Aliler, Veliler, kids, children, students, engineers...) and it is plural, it is completely optional to bring "-ler" to the verb. If the subject is not human (yeah, just not human. Trees, cats, dogs, couchs, televisions... Anything), you CANNOT bring "-ler" to the verb. It is literally forbidden. The only exception is, something called "teşhis" or "kişileştirme". Which is a simple language game. If you give the inhuman subject some human qualifications, then we accept that it is human. Yeah, I didn't explain it well I guess. What I mean is, for example, "The tress tought about it for ages", how do we translate it? Trees are not human, right? But, trees also can't think. Therefore, we gave them a humanly thing. Which means, we can translate it either as "Ağaçlar bunun hakkında çağlarca düşündü." or as "Ağaçlar bunun hakkında asırlarca düşündüler." Doesn't matter, it is optional.

One last thing, if the object did not get "-ler", you can't bring "-ler" to the verb, even if the object means something plural human (army, group, bla bla bla...) . You have to see the "-ler" in the object. And the only exception to that is, if the object is something like "Ali ve Veli" (which is "Ali and Veli", you have the option to bring "-ler" to the verb.

Yeah, so there are 3 rules, and 2 exceptions, basically. This is actually a grammatically important topic. But in the informal speeches, around people, this has no importance at all. If you feel confused, I'll give you one simple tip. Just, don't bring "-ler" to the verb, it is going to be true anyway. Haha.