implemented user login.

next: find a solution for routing

frontend/src/App.svelte

@@ -9,18 +9,20 @@
         translations_ready = true;
     });
 
+    import Footer   from "./Components/Footer.svelte";
     import Homepage from "./Components/Homepage.svelte";
     import Login    from "./Components/Login.svelte";
     import Menu     from "./Components/Menu.svelte";
 </script>
 
 {#if translations_ready }
-{#if user.username }
-<Menu />
-<Homepage />
-{:else}
-<Login />
-{/if}
+    <Menu />
+    {#if user.name }
+        <Homepage />
+    {:else}
+        <Login />
+    {/if}
+    <Footer />
 {:else}
     <p>Loading translations...</p>
 {/if}