Have you tried doing a search directly in your database - the plugins table?
Upgrading vbulletin will not do a thing in regards to the phrase because it isn't a default vbulletin phrase.
You could uninstall all your products AND plugins (not all plugins belong to products), but that may cause some issues on your site depending on the product or plugin and whether you truely completely uninstall it (that means removing all files, plugins, template edits, everything).
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