Translation updates, some messages tweaked.

src/backend/po/ru.po

src/bin/pg_controldata/po/de.po

src/bin/pg_dump/pg_dump.c

src/bin/pg_dump/pg_dumpall.c

src/bin/pg_dump/pg_restore.c

src/bin/pg_dump/po/de.po

src/bin/pg_dump/po/ru.po

src/bin/pg_resetxlog/nls.mk

src/bin/pg_resetxlog/po/de.po

src/bin/psql/command.c

src/bin/psql/copy.c

src/bin/psql/help.c

src/bin/psql/po/de.po

src/bin/psql/startup.c

src/interfaces/libpq/fe-connect.c

src/interfaces/libpq/fe-secure.c

src/interfaces/libpq/nls.mk

src/interfaces/libpq/po/de.po