If the in-app language selector is missing or greyed out, you can manually edit Fluidsim’s configuration file. This method works reliably for Fluidsim 4.x, 5.x, and older releases.
Hope this helps!
The interface will immediately switch, or you may be prompted to restart the application. Festo Fluidsim Change Language
Recalling a tip from a forum, Alex began the "Quest for the English Menu." Here is the story of how Alex conquered the language barrier: The Search for the "Optionen" If the in-app language selector is missing or