Hi Maik,
a translationn tool exist in JDE but you need to licenze this tool separately (if I remeber well).
You can look at official oracle doc for JDE translation tool to understand if it fit your needs.
On the other way you can customize yout application to dinamically set the form title bosed some kind of configuration table (if you need help to design this you can contact me or ask on the list).
We have a tool, but I stopped advertising it some time ago, so I'll need to look it up and see what was the latest JDE release it supported. - it can translate Form, UBE & Version Titles...