Added help text to Series Folder Format.

Fixed styling of format helper buttons

src/UI/Content/form.less

@@ -21,6 +21,12 @@
       margin-bottom  : 0;
       vertical-align : middle;
     }
+
+    .btn {
+      i {
+        margin-right: 0px;
+      }
+    }
   }
 }