Merge branch 'feature/ISTWCMS-6986-kpaxman-nav_labels' into '1.1.x'

ISTWCMS-6986: add aria-label to nav elements

See merge request !228

src/patterns/04-components/menu/menu--horizontal/menu--horizontal.twig

-<nav class="uw-horizontal-nav {% if modifier_classes %} uw-horizontal-nav--{{ modifier_classes }}{% endif %}">
+{% if 'header' in modifier_classes %}
+  {% set label='University of Waterloo navigation' %}
+{% elseif 'main' in modifier_classes %}
+  {% set label='Site navigation' %}
+{% elseif 'secondary' in modifier_classes %}
+  {% set label='Site secondary navigation' %}
+{% endif %}
+<nav class="uw-horizontal-nav {% if modifier_classes %} uw-horizontal-nav--{{ modifier_classes }}{% endif %}"{% if label %} aria-label="{{ label }}"{% endif %}>
     <div class="uw-horizontal-nav--wrapper">
       {% if include_home %}
         <div class="uw-horizontal-nav--home">