Comment section not using Site Language

The problem

Most comment related elements are in English although the Site language is set to Icelandic.

Example 1:

Try to comment without inserting name or email.

Using Loco translate I can confirm that all strings are already fully translated. They just don’t show up in Icelandic on the site.

Example 2:

The string: „Save my name, email, and website in this browser for the next time I comment.“ should be in Icelandic.

This string is not shown in the WordPress language file. Where can I change it?

Sigurður Hólm Gunnarsson

Sigurður Hólm Gunnarsson

Sigurður Hólm Gunnarsson er iðjuþjálfi og sáttamiðlari.
Sigurður rekur ráðgjafastofuna Allir sáttir og vefþjónustuna ProXima.