Use content types label not machine name for calendar title

src/Controller/CalendarController.php

@@ -36,7 +36,16 @@ class CalendarController extends ControllerBase {
 
   public function calendarTitle($ebundle) {
     $bundle = ebundle_split($ebundle, 'bundle');
-    return t('@bundle Calendar', array('@bundle' => ucwords($bundle)));
+    $titlePrefix = $bundle;
+    $entityTypeManager = \Drupal::service('entity_type.manager');   
+    $contentTypes = $entityTypeManager->getStorage('node_type')->loadMultiple();
+    foreach ($contentTypes as $contentType) {
+      if($contentType->id() == $bundle) {
+        $titlePrefix = $contentType->label();
+        break;
+      }
+    }
+    return t('@bundle Calendar', array('@bundle' => ucwords($titlePrefix)));
   }
 
   private function getBundleCalendar($ebundle, $selected_month = null, $selected_day = null) {