[Gelöst] translator editing don't work

Background of the issue:
I am trying to edit a translated text, but the editing process doesn't work. When I attempt to edit, it redirects me to a blank page. You can see the issue at this link: versteckter Link.

Symptoms:
When attempting to edit a translated text, I encounter a blank page and cannot proceed with editing to correct the translations.

Questions:
Why does the page go blank when I try to edit a translated text?
How can I fix the issue to edit the translated text successfully?