MDL-54832 workshop: adding landmark for userplantable

Accessibility enhance: add an aria-label on the userplan table so
that it's accessible to me through my screen reader

mod/workshop/lang/en/workshop.php

@@ -308,6 +308,7 @@
 $string['userdatemodified'] = 'modified on <span>{$a}</span>';
 $string['userplan'] = 'Workshop planner';
 $string['userplan_help'] = 'The workshop planner displays all phases of the activity and lists the tasks for each phase. The current phase is highlighted and task completion is indicated with a tick.';
+$string['userplanaccessibilitytitle'] = 'Workshop timeline with {$a} phases';
 $string['useselfassessment'] = 'Use self-assessment';
 $string['useselfassessment_help'] = 'If enabled, a user may be allocated their own submission to assess and will receive a grade for assessment in addition to a grade for their submission.';
 $string['useselfassessment_desc'] = 'Students may assess their own work';

mod/workshop/renderer.php

@@ -283,6 +283,9 @@ protected function render_workshop_example_submission_summary(workshop_example_s
     protected function render_workshop_user_plan(workshop_user_plan $plan) {
         $table = new html_table();
         $table->attributes['class'] = 'userplan';
+        $table->attributes['role'] = 'section';
+        $numberofphases = count($plan->phases);
+        $table->attributes['aria-label'] = get_string('userplanaccessibilitytitle', 'workshop', $numberofphases);
         $table->head = array();
         $table->colclasses = array();
         $row = new html_table_row();