+++ This bug was initially created as a clone of Bug #51059 +++
When I tried to add a link to an existing item in the page above, I got the error
<p>Link do site <a class="external text" href="//en.wikipedia.org/wiki/Relational_algebra">Relational algebra</a> já utilizado pelo item com o ID <a href="/wiki/Q840540" title="Q840540">Q840540</a>.
</p>
which has a link to Portuguese Wikipedia instead of Wikidata.
Version: unspecified
Severity: normal
URL: https://pt.wikipedia.org/wiki/Divis%C3%A3o_(%C3%A1lgebra_relacional)