Can I add the _lang parameter in the preview function for secondary languages?
In the "Front-end preview path" field in the content structure editor, set the URL with the parameter /?_lang={$smarty.request._doc_lang}.
When you call the preview URL from the secondary language editor page, the _lang parameter will be added automatically.
Setting
In the "Front-end preview path" field of the content structure editor.
Displaying URL
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