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

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

Commit: 32b58d0220de9ea13670a2a9fff61360abfa36bc
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2008-03-24T19:12:49Z
Releases: 8.4.0
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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