By default, use browser host & port for WEBMIN API

app/js/lib/conf/conf.js

+module.exports = {
+  "server": "", // Empty server will use the browser current host
+  "port": "",   // Empty port will use the browser current port
+  "default_port": 9220,
+  "dev_autoconf": false
+};

app/js/lib/conf/conf.json

-{
-  "server": "localhost",
-  "port": 9220,
-  "default_port": 9220,
-  "dev_autoconf": false
-}

app/js/services/bma.js

@@ -182,7 +182,9 @@ module.exports = (angular) => {
           }
         }
       }
-      var service = BMA([conf.server, conf.port].join(':'));
+      let server = conf.server || window.location.hostname;
+      let port = conf.port || window.location.port;
+      var service = BMA([server, port].join(':'));
       service.instance = BMA;
       return service;
     });