introduce warning-progress-bar-color when using -15% of the given web/traffic max-warn level (default 90%), fixes #1567

Signed-off-by: Michael Kaufmann (d00p) <d00p@froxlor.org>

templates/Sparkle/assets/css/main.css

@@ -785,6 +785,10 @@ select[multiple="multiple"] {
 	background-color:#dd514c;
 }
 
+.progress-warn .bar {
+	background-color:#e6b64e;
+}
+
 .maintable {
 	width:90%;
 }