Index: lams_central/web/addLesson.jsp
===================================================================
diff -u -rd432ad1e56c019311c8ca428ba8e08907a56077c -r70e6fe3062072e2c6188217c562a4f33f0838604
--- lams_central/web/addLesson.jsp	(.../addLesson.jsp)	(revision d432ad1e56c019311c8ca428ba8e08907a56077c)
+++ lams_central/web/addLesson.jsp	(.../addLesson.jsp)	(revision 70e6fe3062072e2c6188217c562a4f33f0838604)
@@ -22,6 +22,7 @@
 	<script type="text/javascript" src="${lams}includes/javascript/yui/animation-min.js"></script>
 	<script type="text/javascript" src="${lams}includes/javascript/yui/json-min.js" ></script> 
 	<script type="text/javascript" src="${lams}includes/javascript/yui/treeview-min.js" ></script>
+	<script type="text/javascript" src="${lams}includes/javascript/popper.min.js"></script>
 	<script type="text/javascript" src="${lams}includes/javascript/bootstrap-material-design.min.js"></script>
 	<script type="text/javascript" src="${lams}includes/javascript/bootstrap.tabcontroller.js"></script>
 	<script type="text/javascript" src="${lams}includes/javascript/addLesson.js"></script>
@@ -104,7 +105,7 @@
 					</table>
 				</lams:TabBody>
 				<lams:TabBody id="2" titleKey="label.tab.class">
-					<!-- Class panel -->
+					<!-- Class card -->
 					<div id="tabClassTitle" class="tabTitle bg-warning"><fmt:message key="label.tab.class.title" /></div>
 					<table id="classTable" class="tabTable">
 						<tr>