ported legacy functions

frontend/src/App.svelte

@@ -32,6 +32,7 @@
         <!-- https://github.com/notnotsamuel/svelte-tiny-router -->
             <Menu />
             <Route path="/user" component={User} />
+            <Route path="/user/login" component={User} />
             <Route path="/user/:user_id/edit" component={UserEdit} />
             <Route path="/user/oidc/add" component={EditService} />
             <Route path="/user/oidc/edit/:serviceName" component={EditService} />

frontend/src/routes/user/User.svelte

@@ -6,6 +6,12 @@
     import LoginServiceList from './LoginServices.svelte';
     import Profile from './Profile.svelte';
     import UserList from './List.svelte';
+
+    let params = new URLSearchParams(location.search);
+    let redirect = params.get('returnTo');
+    if (redirect && user.name){
+        location.href = redirect;
+    }
 </script>
 
 <h1>{t('user.user_module')}</h1>