Then I just had the Medion (Aldi Talk) Connection wizard installed (this can be downloaded at Aldi Talk on the Internet), which then also immediately recognized my Aldi Sim card and me UMTS signal indicated.
After that I just uninstalled the Safari software, which can now be used without the error message AldiTalk Connection Manager.
Because the undesired branding with associated software, there are 1 star deduction, because I had this offer, the higher price of 24,99 chosen because it should contain no branding.