Maybe you can try rerunning the installer script:
http://yourhost/wiki/config/
You will have to make a backup of your LocalSettings.php file since
the installer
script will not run if you already have one. The installer
should run the updater script or at least regenerate mediawiki: messages.
Hello, Ashar!
Do you think it is possible to rebuild all messages of the English
Wikipedia to comply with UTF-8 as the language for any future contribution?
Best,
Plamen