chose background images pseudo-randomly based on user-agent and every quarter of the hour. enable turbolinks again...
cache kuenstler and lehrer
add link to old website
fix programm more translation
simple fix for top menu when fuzzy recognition succeeded but no pattern matched
reduce sql requests in kursplan and profitraining. add redirects from and to old site URLs.
fix a missing translation
improve kursplan performance by checking event_details directly. all event_details must be weekly