MDL-85902 course: Convert activity navigation to a navigation landmark

Author: junpataleta

course/templates/activity_navigation.mustache

@@ -64,7 +64,7 @@
         }
     }
 }}
-<div class="mt-5 mb-1 activity-navigation container-fluid">
+<nav class="mt-5 mb-1 activity-navigation container-fluid" aria-label="{{#str}}activitynavigation, course{{/str}}">
 {{< core/columns-1to1to1}}
     {{$column1}}
         <div class="float-start">
@@ -82,4 +82,4 @@
         </div>
     {{/column3}}
 {{/ core/columns-1to1to1}}
-</div>
+</nav>

lang/en/course.php

@@ -40,6 +40,7 @@
 $string['activitydate:closes'] = 'Closes:';
 $string['activitydate:opened'] = 'Opened:';
 $string['activitydate:opens'] = 'Opens:';
+$string['activitynavigation'] = 'Activity navigation';
 $string['aria:coursecategory'] = 'Course category';
 $string['aria:courseshortname'] = 'Course short name';
 $string['aria:coursename'] = 'Course name';