I couldn't find any topic on this but theoretically, could I upload the same comic in different languages? And how would I go about that, just make it as a separate comic? Or is there there's any other way to do it?

Methinks creating a separate comic would be the best way to go. Maybe include the national flag on the little avatar so it's immediately distinguishable on the Latest Updates list.

Flag sounds like a good idea, I'll keep that in mind!