Hi Phil,
Indeed this is the property that need to be set in the ConfigFile.xml or ListConfigFile.xml files:
In order to make the localization to work you need to copy the files from Program Files\Common Files\Microsoft Shared\web server extensions\wpresources\RadEditorSharePoint\x.x.x.x__1f131a624888eeed\Resources\App_GlobalResources folder to \Inetpub\wwwroot\wss\VirtualDirectories\80\App_GlobalResources folder.
Best regards,
Rumen
the Telerik team
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