Fix various infelicities that have snuck into usage of errdetail() and

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 63995f01edcf0101ea2efa751fb999cb6f5d853f
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2008-03-24T19:12:58Z
Releases: 8.3.2
Fix various infelicities that have snuck into usage of errdetail() and
friends.  Avoid double translation of some messages, ensure other messages
are exposed for translation (and make them follow the style guidelines),
avoid unsafe passing of an unpredictable message text as a format string.

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