.
Try this. Reupload the original vbulletin-language.xml file to the install directory. Then upload the tools.php script in the 'do_not_upload' folder of the vB zip file to your Admin CP directory and run it from your brow
ser. Then reimport the vbulletin-language.xml file. Immediately remove tools.php when you are done.
Then run this in the Admin CP:
Admin CP -> Languages & Phrases -> Language Manager -> [Rebuild All Languages]