Use _() macro consistently rather than gettext(). Add translation

src/backend/catalog/dependency.c

src/backend/libpq/auth.c

src/backend/libpq/pqcomm.c

src/backend/parser/scan.l

src/backend/postmaster/postmaster.c

src/backend/storage/lmgr/deadlock.c

src/backend/tcop/postgres.c

src/backend/utils/error/elog.c

src/backend/utils/misc/help_config.c

src/bin/initdb/initdb.c

src/bin/pg_config/pg_config.c

src/bin/pg_controldata/pg_controldata.c

src/bin/pg_ctl/pg_ctl.c

src/bin/pg_dump/pg_backup_archiver.c

src/bin/pg_dump/pg_dump.c

src/bin/pg_dump/pg_dumpall.c

src/bin/pg_dump/pg_restore.c

src/bin/pg_resetxlog/pg_resetxlog.c

src/bin/psql/command.c

src/bin/psql/common.c