<a href="{{url}}" class="external {{classes}}" target="_blank"
   {% if title %}title="{{title}}"{% endif %}
   aria-label="Link opens in a new window">{{text}}</a>

<a href="{{url}}" class="external {{classes}}" target="_blank"
   {% if title %}
   title="{{title}}" aria-label="{{title}}, Link opens in a new window"
   {% else %}
   aria-label="{{text}}, Link opens in a new window"
   {% endif %}
>{{text}}</a>

Add the text of the link to the aria-label.
Add the text of the link to the aria-label.

Previously, screen readers would only read "Link opens in a new window"
without the link's text.
