email text adapted, hostname created from config file

config/config.js

 module.exports = {
   development: {
     app: {
-      hostname: 'm4lab.hft-stuttgart.de',
+      hostname: 'm4lab.hft-stuttgart.de/account/',
       name: 'User Account Management',
       hostname: 'm4lab.hft-stuttgart.de/account',
       port: process.env.PORT || 9989