discourse/app/views/email/unsubscribed.html.erb

<div class='container unsubscribe'>
  <br>
  <h2><%=t "unsubscribed.title"%></h2>
  <br>
  <p>
    <%=t("unsubscribed.description", email: @email, url: path("/my/preferences")).html_safe %>
  </p>

  <% if @topic %>
  <p>
    <%=t("unsubscribed.topic_description", link: render_topic_title(@topic)).html_safe%>
  </p>
  <% end %>
</div>