When a translation is published using Content and Section Translation, the original page and the translation created are automatically connected in Wikidata as equivalent. This is supported on mobile (T294006) and desktop (T87410) editors.
Currently articles get connected even if the source page is from the user namespace. User namespace pages can be used to draft the contents to be translated but may not represent the original content that should be connected on Wikidata. An example of this are the articles prepared for the Medicine Translaiton project. This conversation on Wikidata provide more details.
This ticket proposes to avoid connecting the published pages on Wikidata when the source page is from the user namespace.
Additionally we could consider to include a URL parameter that allows external tools to indicate to which item to connect the translation by providing a Wikidata Q-id.