bugfix: menu code did not properly handle module paths on non-top-level pages

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

frontend/src/Components/Menu.svelte

@@ -59,7 +59,7 @@ onMount(fetchModules);
     </form>
     <button class="symbol" onclick={e => expand = !expand}> </button>
     {#each modules as module,i}
-    <a href={module.module} {onclick} class={module.class}>{@html t(module.title)}</a>
+    <a href={module.module.includes('://') ? modules.module : '/'+modules.module} {onclick} class={module.class}>{@html t(module.title)}</a>
     {/each}
     {#if user.id == 2}
     <a href="https://svelte.dev/tutorial/svelte/state" target="_blank">{t('tutorial')}</a>