Strange, I could edit everything, except the German title.

The field is locked ( ) and therefore can't be edited. Locked content is assumed to be verified content, but we sometimes make mistakes. You can use the "Report" button to report incorrect locked content.

the German title should be "Der Glücksbärchi-Film" - like on the movie picture

Some of the German artwork appear to use a slightly different spelling: Der Glücks-Bärchi Film (trailer, poster). Which one is used in the film's opening credits?