pgsql: Message style improvements

Message style improvements

Some message style improvements in new code, and some small
refactorings to make translations easier.

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/a876464abc73eccc04543da6a12eb5b1ffcd6dfd

Modified Files
--------------
src/bin/pg_basebackup/pg_createsubscriber.c        | 12 +++---
src/bin/pg_basebackup/pg_recvlogical.c             |  2 +-
src/bin/pg_basebackup/t/040_pg_createsubscriber.pl |  4 +-
src/bin/pg_dump/pg_dump.c                          |  8 ++--
src/bin/pg_dump/pg_dumpall.c                       |  8 ++--
src/bin/pg_dump/pg_restore.c                       | 43 +++++++++++++---------
src/bin/pg_dump/t/001_basic.pl                     |  4 +-
src/bin/pg_dump/t/006_pg_dumpall.pl                |  2 +-
src/bin/pg_upgrade/check.c                         |  4 +-
src/bin/pg_upgrade/relfilenumber.c                 | 12 +++---
src/bin/pg_upgrade/t/005_char_signedness.pl        |  2 +-
src/bin/pg_upgrade/task.c                          |  5 +--
src/bin/psql/command.c                             |  6 +--
src/bin/psql/describe.c                            |  5 ++-
src/bin/psql/help.c                                |  6 +--
src/bin/psql/variables.c                           | 10 ++---
16 files changed, 70 insertions(+), 63 deletions(-)