This thread is resolved. Here is a description of the problem and solution.
The links from the widget translation are leading to 404 page.
Make sure that the quotation marks from the end of the link are correct, in the translations added in WPML → String translation area.
... href="https://www.artificia.pro/ca/politica-privacitat-gdpr'' ...
... href="https://www.artificia.pro/ca/politica-privacitat-gdpr/" ...
The last pair of quotation marks is different.
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