Thread: Change Link for "Add New" Button

Change Link for "Add New" Button

I wanna change the Link for the Add New Button because the Url is in english and my site gonna be in german.
Under Site i changed de Permalink and Titel.
Also found a solved Thread here where the Solution was:
change it from: define('CP_ADD_NEW_URL', get_bloginfo('url').'/add-new/');
To:
define('CP_ADD_NEW_URL', get_bloginfo('url').'/index.php/add-new/');

but when I change it to: define('CP_ADD_NEW_URL', get_bloginfo('url').'/neue-anzeige-erfassen/'.get_option($app_abbr.'_add_new_url').'/');
I get an Error, do I have to delete the part behind the "."?

Thank you in advance for your help!

Kevin