Use css to add the beta symbol to the beta-label

services/web/app/views/beta_program/opt_in.jade

@@ -26,5 +26,5 @@ block content
 														type="submit"
 													)
 														span #{translate("beta_program_opt_in_action")}
-														span.beta-feature-badge(tooltip="Beta Feature" tooltip-placement="right") β
+														span.beta-feature-badge()
 											

services/web/public/stylesheets/app/beta-program.less

@@ -15,4 +15,7 @@
 	padding-bottom: 4px;
 	padding-top: 2px;
 	margin-left: 12px;
+	&:before {
+		content: "β";
+	}
 }