Product chips: add "Strb" for tram

Oh NASA/HAVAG, you so weird

sass/src/common/local.scss

@@ -214,7 +214,7 @@ ul.route-history > li {
 		border-radius: 5rem;
 		padding: .2rem .5rem;
 	}
-	&.STR, &.Tram, &.Str, &.STB {
+	&.STR, &.Tram, &.Str, &.Strb, &.STB {
 		background-color: #c5161c;
 		border-radius: 5rem;
 		padding: .2rem .5rem;