There is always the biggest evil of all... Putting SHOW / DESCRIBE / HELP commands into the backend itself. I'm sure the pgAdmin group likes that idea (they're probably tired of maintaining 4 different versions of queries for getting a list of tables). Any solution to make psql backward or forward compatible should go an additional step to assist other frontends as well.
Really, is the problem with translation that you might want different translation in your client psql compared to the server?
Chris
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