Add restriction of client_encoding in Japanese document.
Add restriction of client_encoding in Japanese document.

bwtakacy/prev_pg_bulkload_repo,bwtakacy/pg_bulkload,bwtakacy/pg_bulkload,bwtakacy/prev_pg_bulkload_repo,ooyamams/pg_bulkload,bwtakacy/prev_pg_bulkload_repo,bwtakacy/pg_bulkload,ooyamams/pg_bulkload,ooyamams/pg_bulkload