ISTWCMS-3505: more fixes for the header and global header menu

source/_patterns/03-layouts/header/header.twig

@@ -5,11 +5,13 @@
 <header {{ add_attributes(additional_attributes) }} role="banner">
     <div class="uw-header__wrapper">
         {% include "@components/site-logo/site-logo.twig"%}
-        {% block content %}
-            {% include "@components/menu/menu--header/menu--header.twig" with {
-                'items': items
-            } %}
-        {% endblock %}
+        <nav class="uw-header-menu" aria-label="University">
+            {% block content %}
+                {% include "@components/menu/menu--header/menu--header.twig" with {
+                    'items': items
+                } %}
+            {% endblock %}
+        </nav>
     </div>
     {% include "@global/01-colors-bars/_color-bar.twig" %}
 </header>

source/_patterns/04-components/menu/menu--header/menu--header.twig

-<div class="uw-header-menu">
-  {% include '@components/menu/menu.twig' with {
-    'menu_name': menu_name,
-    'items': items
-  } %}
-</div>
\ No newline at end of file
+{% include '@components/menu/menu.twig' with {
+  'menu_name': menu_name,
+  'items': items
+} %}
\ No newline at end of file