Added screen reader text to events.

css/laps.less

@@ -1,6 +1,7 @@
 @import (reference) "../vendor/twbs/bootstrap/less/variables.less";
 @import (reference) "../vendor/twbs/bootstrap/less/mixins.less";
 @import (reference) "../vendor/twbs/bootstrap/less/progress-bars.less";
+@import (reference) "../vendor/twbs/bootstrap/less/scaffolding.less";
 @import "variables.less";
 
 #wpadminbar {
@@ -59,6 +60,10 @@
 		.event-http {
 			background-color: @event-warning-color;
 		}
+
+		.sr-only {
+			.sr-only;
+		}
 	}
 
 	@import "../vendor/twbs/bootstrap/less/tooltip.less";