Hello Tim,
thank you very much I have installed the dev version, unfortunately the problem still exists. The whole website is translated perfectly, your tool works perfectly, except for this one point.
How can I provide you with all the plugins? These are licensed plugins that only work with a license key. I could also set up access to the site for you, which would be much easier as you would then be in the complete environment. I would make a backup beforehand and you could move around freely. Would that help?