add bootstrap icons for calendar invite status in calendar context menu

calendar/inc/class.calendar_bo.inc.php

@@ -119,6 +119,13 @@ class calendar_bo
 		'D' => 'Delegated',
 		'G' => 'Group invitation',
 	);
+    var $status_images = array(
+        'A' => 'check-lg',
+        'R' => 'x-circle',
+        'T' => 'clock-history',
+        'U' => 'question-lg',
+        'D' => 'share',
+    );
 	/**
 	 * @var array recur_types translates MCAL recur-types to verbose labels
 	 */

calendar/inc/class.calendar_uiviews.inc.php

@@ -952,6 +952,7 @@ class calendar_uiviews extends calendar_ui
 			$status = array(
 				'id' => $id,
 				'caption' => $status,
+                'icon' => $ui->bo->status_images[$id],
 				'onExecute' => 'javaScript:app.calendar.status'
 			);
 		}