rebuildMessages.php --rebuild didn't help. The Main Page's {{SITENAME}} was still rendered as the former one. However "&action=purge" fixed it for now. Too bad I don't know how to do a "&action=purge" "to the maximum extent of the law on all places where the old {{SITENAME}} germs may be hiding. Ah ha. Finally reproduced something: $ echo -n 首頁|php deleteBatch.php $ php importTextFile.php --title 首頁 首頁 and now {{SITENAME}} is rendering back to it former name! Well! I had better always do a &action=purge as a third step then when I update a page that way.