Fixed screen reader text.

views/laps.mustache

@@ -2,7 +2,7 @@
     <div class="laps-timeline">
     	{{#events}}
     		<div class="event event-{{category}}" data-toggle="tooltip" title="{{description}}" style="width:{{width}}%; left:{{offset}}%;">
-                <span class="sr-only">{{descriptiondescription}}</span>
+                <span class="sr-only">{{description}}</span>
             </div>
     	{{/events}}
     </div>