display maintenance message with raw

app/views/layouts/application.html.erb

@@ -13,7 +13,7 @@
 	<div class="container shadow-lg rounded-3 border p-4 p-md-5 my-md-3">
 		<% if AppSettings.app_maintenance == "true" %>
 			<div class="alert alert-warning text-center" role="alert">
-				<strong>Attention:</strong> <%= AppSettings.app_maintenance_message %>
+				<%= raw(AppSettings.app_maintenance_message) %>
 			</div>
 		<% end %>
 		<header>