There are two columns in the firewall rules window, one lists the application name and the other lists the ruleset that the application is set as. If an application is not set to use any of the firewall rulesets that are configured in the rulesets settings then it will be named "Custom" but in your case it would be "user" to indicate a user rule and not a defined ruleset. Any rule that is added without using a pre-defined ruleset will be named by default custom or in your case user. Again it just categorizes the type of ruleset being used for the given application, whether it is set as an allowed application, blocked application, outgoing only, web browser, or a custom user rule. Because the rules don't match a pre-defined ruleset it therefore is named user or custom if using the English language interface.