pgsql: Error message refactoring

Error message refactoring

Take some untranslatable things out of the message and replace by
format placeholders, to reduce translatable strings and reduce
translation mistakes.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/3ad5f07c0fe9a734fb4e2484c7165f9280dbefa7

Modified Files
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src/backend/replication/logical/launcher.c |  4 ++--
src/backend/replication/slot.c             |  2 +-
src/backend/storage/lmgr/lock.c            | 12 ++++++------
src/backend/storage/lmgr/predicate.c       |  6 +++---
4 files changed, 12 insertions(+), 12 deletions(-)