Hello my friends
It's me again.
Only for your interest.
The problem happend again and i did not change anything (language file or *.php or anything else).
Then i changed the comment moderator approval from "Yes" to "No".
It worked again.
I changed it back from "No" to "Yes" and it's still working.
This is strange, isn't it? I really changed nothing and my comments are working correctly since more than 1,000 entries on my website.
So, maybe this is one of the "temporary" solutions to change the comments approval from "Yes" to "No" and to "Yes" back again... but i'm not sure.
I only want to let you know and maybe it helps some people.
greets and happy weekend!
kj