Making a standalone publication out of the English translation of a paper
If the copyright has not expired yet (varies by country but generally around 70-100 years after the death of the author), then it is illegal for you to publish a translation without prior authorization. You need to find out who the copyright holder is and ask for permission.

The journal may have acquired rights to publish a translation, otherwise you may need to find their child(ren, and figure out which of them would legally be the copyright holder now) to get authorization. It's likely to be an intractable problem.