The translators of the Bible didn’t write the content.
You are correct that the books were not written by the translators.
But the bible, the authorship of the bible, where all the books were put together, was written by Jerome.
He was the first to put together the canon as we know it now. Prior to Jerome, the books were separate from one another, and when placed together, did not have a consistant canon.
This is why we have books, and letters, gospels and the apocalypse, all different books, but just one bible.
And the 70 did the prequel. Some suggest that the prequel wasn’t quite as good.