Hi,
thank you for the advise.
Unfortunately for me I don't know how to debug php yet.
I've "managed" to sort out this issue by editing the original file plugins/cck_field_link/content_delete/content_delete.php and instead: COM_CCK_CONFIRM_DELETE, I just wrote: Are you sure you want to permanently delete this item(s)?.
I know I will have to change it after every update of seblod but I'm afraid that's my abilities at the moment.
If someone comes up with an idea how to permanently sort out this problem I will be more than grateful.
Best regards
Ricco