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Isn't this something that should be addressed with the onsite template?

The output (by the template) is OK, I suppose. But I think Nemo_bis means the actual wikitext added automatically by UploadWizard should include newlines per {{xx|Text}}

So instead of
 |description={{it|1=Italian text}}{{en|1=English text}}
UploadWizard should add
 |description={{it|1=Italian text}}
{{en|1=English text}}

Yes. Otherwise the row can easily reach thousands of columns and this makes more difficult to edit the description in other languages for newbies.

Patch submitted, awaiting review: https://gerrit.wikimedia.org/r/7687

Merged in cbd8871d2bce49d503377beb7becc927595e096c