Remove the default_language xproperty that could be set in XWikiUsers xobjects since it was not working (since a very long time ago, possibly 1.1M3) and it was not a very useful and used xproperty.
Choose the export format from the list below:
Export as Portable Document Format (PDF) using the Web Browser
Export as HyperText Markup Language (HTML)
Select the pages to export:
Remove the default_language xproperty that could be set in XWikiUsers xobjects since it was not working (since a very long time ago, possibly 1.1M3) and it was not a very useful and used xproperty.