W. van den Akker wrote:
> Is it somehow possible to extract the transaction logging?
No.
> Secondly, how can I determine which user is locking a record?
Use the system table pg_locks.
> How can I present the errormessages in 'Dutch' to the users.
You would need to write such a translation first. See
http://developer.postgresql.org/~petere/nlsinfo/ to get started.