improved style of main menu and message settings for mobile devices

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

frontend/src/Components/Menu.svelte

@@ -69,7 +69,7 @@ onMount(fetchModules);
     <a href="/wiki"     {onclick} class="wiki">{t('wiki')}</a>
     <a href="/contact"  {onclick} class="contact">{t('contacts')}</a>
     <a href="/stock"    {onclick} class="stock">{t('stock')}</a>
-    <a href="/message"  {onclick} class="message">{t('messages')}</a>
+    <a href="/message"  {onclick} class="message">{@html t('messages')}</a>
     {#if user.id == 2}
     <a href="https://svelte.dev/tutorial/svelte/state" target="_blank">{t('tutorial')}</a>
     {/if}