> Note: copyright is based on the translation date, not the original language.

It’s based on both. For example, a translation or other derivative work whose copyright expired “early” in the US due to non‐renewal would still be encumbered by the copyright of the original. That’s basically what happened to It’s a Wonderful Life—the film is technically in the public domain, but is still held in Paramount’s iron grip by way of the renewed copyright of the original short story.