SEO - Fallback language page - Non Canonical URL - Duplicate content

[jbpenrath]

Feature Request

Is your feature request related to a problem or unsupported use case? Please describe.
Currently, when a page does not exist for the active language, we gracefully fallback to another language version if it exists.

It has advantages to expose the full catalog to all available languages even if course has been translated.

But it appears there is a drawback for SEO. Indeed, currently, those pages appears like duplicated content.

Solution
The concept of canonical url could be useful here, to target the original page through metadata when the page displayed is a fallback.