New answers tagged export
1st as you figured out, Wordpress does not offer any built in multilingual support for posts and pages. 2nd Themes, plugins etc. need a separate translation workflow than pages. But that is usually ok, since the theme does not change as much as the pages (normally). To translate the themes I would recommend Loco Translate ...
Export Users to CSV plugin does support exporting user fields, out of the box. That should work. And, later if you intend to import them to another site, you can try WP All Import plugin. Hope that helps.
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