It’s another issue. I made the former text menu a panel, and now it cannot be called with a hotkey anymore. wm.call_menu requires a menu type class, not a panel type class.
I could make the panel class another name, and readd the text menu class. But this would introduce other trouble then. What mainly stops me here is that this menus would only be good for hotkeys and the Blender workflow then. And Bforartists does simply not stand for hotkeys and the Blender workflow.
When you want to work like in Blender, then you should use Blender.