[simple] add aria-label to preferences link

searx/templates/simple/base.html

@@ -49,7 +49,7 @@
 
     {% block linkto_preferences %}
     {% from 'simple/icons.html' import icon_big %}
-      <nav id="linkto_preferences"><a href="{{ url_for('preferences') }}">{{ icon_big('menu-outline') }}</a></nav>
+      <nav id="linkto_preferences"><a href="{{ url_for('preferences') }}" aria-label="{{ _('preferences') }}">{{ icon_big('menu-outline') }}</a></nav>
     {% endblock %}
     {% block header %}
     {% endblock %}