Mark some untranslatable messages with errmsg_internal

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/b64f18c583675684766e364754bd3c9f702c549d

Modified Files
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src/backend/access/transam/xlog.c |   56 ++++++++++++++++++++----------------
1 files changed, 31 insertions(+), 25 deletions(-)

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Next:	From: Alvaro Herrera	Date: 2011-09-05 22:22:27
	Subject: pgsql: Adjust translator comment format to xgettext expectations
Previous:	From: Peter Eisentraut	Date: 2011-09-05 20:39:28
	Subject: pgsql: Improve "invalid byte sequence for encoding" message