Thanks, can’t wait for the dutch translation!
I also had the double login problem. But I got rid of it by deleting and saving the page without the ‘[theme-my-login-page]’ tag, and then put it back and save it again. Poof, it was normal again.
The new navigation links are fine, but better make them optional, or at least allow people to adjust the link text, e.g. because of localization issues.
Thanks for the plugin!