A quick and easy method to change the primary language under Mac OS X is to open a terminal window, and run is command…
sudo \”/System/Library/CoreServices/Language Chooser.app/Contents/MacOS/Language Chooser\”
Select your language, close the language chooser and restart your system to invoke the changes. Â There have been a few reports of the language settings being damaged during Mac OS X 10.5.7 installs… Â This should help prevent that issue….