this plugin is what I needed. Thanks.
Here are my problems:
I didn't understand how to hide some titles ("Log in" and "Welcome, name"). Using filters? Own translation? WHERE?
I don't want them to show anywhere.
How to say where an edited user-panel.php ist?
I've tried to copy it in my directory and inserted the code for that. The user panel was shown twice after login :D
So how to do that without checking after each update?