That does look like a bug, except that I can't replicate it. With 6.4.3.8 installed, set NOT to Start With Windows and with Background Profiles Disabled turned off (or on, for that matter), I can't get it to display that text. But as it seems it may be a function of something(s) you did while the UI was set to German and is now set to English (and neither of us know exactly what that was, or in what order), it may be hard to trace.
Can you actually Add a program (and Remove it)? If so, what happens to the text stating you can't?
Can you actually Add a program (and Remove it)? If so, what happens to the text stating you can't?