Thank you for your reply!
There are 2 problems with this solution:
1) changing the decimal separator for German is something that would confuse many people - especially as it is common to have the '.' dot as grouping symbol in German. Numbers look like that in German: 3.400,56 - so changing the decimal separator would make numbers rather hard to understand in German speaking Countries - not to think about all the other (calculating) impacts it might have...
2) it does not work :-) I have tried it on several machines, and in several ways, but without success... probably I'm doing something wrong, but it is not working for me...
So still waiting for Apple :-) without iCloud on my machine for now...
Thank you!