After I sent a comment from my Website, a new site appears with this message:

{"message":"Kommentar hinzugef\u00fcgt, wartet auf Freigabe."}

That is not very smart. Were can I change this message, or better, what can I do, to get back to previous site?

Look here: www.bauredakteur.de/blog/31-rohbau/fachwerk-begriffe-und-konstruktion.html

Your site is not loading for me. I get "Error displaying the error page: Application Instantiation Error: Could not connect to MySQL." The message after comment is not supposed to be displayed in a new page. In your case i guess that there are javascript errors in your page however i cannot tell more since your site is not loading.