pgsql: pg_upgrade: Tweak translatable strings

pg_upgrade: Tweak translatable strings

"\r" (for progress output) must not be inside a translatable string
(gettext gets upset).

In passing, move the minimum supported version number to a separate
argument, so that we don't have to retranslate this string every year
now.

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/da1c0acd0a61eb8c1d62725ded9c219e783cc6a2

Modified Files
--------------
src/bin/pg_upgrade/check.c | 3 ++-
src/bin/pg_upgrade/util.c  | 5 ++++-
2 files changed, 6 insertions(+), 2 deletions(-)