Header: Add header to timeline

refs #7976

modules/monitoring/application/controllers/TimelineController.php

@@ -19,7 +19,8 @@ class Monitoring_TimelineController extends Controller
         $this->getTabs()->add($action, array(
             'title' => $title,
             'url' => Url::fromRequest()
-        ))->activate($action);
+        ))->activate($action)
+            ->setTitle($this->translate('Timeline Navigation'));
         $this->view->title = $title;
     }
 

modules/monitoring/application/views/scripts/timeline/index.phtml

@@ -10,6 +10,9 @@ $firstRow = !$beingExtended;
 <div class="controls">
     <?= $this->tabs ?>
     <div style="margin: 1em;" class="dontprint">
+        <h2 tabindex="-1" class="sr-only">
+            <?= $this->translate('Filters') ?>
+        </h2>
         <?= $intervalBox; ?>
     </div>
     <div style="margin: 1em;" class="timeline-legend">
@@ -22,6 +25,7 @@ $firstRow = !$beingExtended;
     </div>
 </div>
 <div class="content" data-base-target="_next">
+    <h1 tabindex="-1"><?= $this->translate('Timeline'); ?></h1>
     <div class="timeline">
 <?php endif ?>
 <?php if ($switchedContext): ?>