working better, small changes

ht_booking/assets/views/base.html

@@ -15,7 +15,7 @@
       <a href="/" class="text-lg font-bold">{{ t(key="brand", lang=lang) }}</a>
       <nav class="flex items-center gap-4 text-sm">
         <a href="/" class="hover:underline">{{ t(key="nav-calendar", lang=lang) }}</a>
-        {% if is_admin %}
+        {% if logged_in | default(value=false) %}
         <a href="/admin" class="hover:underline">{{ t(key="admin-title", lang=lang) }}</a>
         <a href="/admin/courts" class="hover:underline">{{ t(key="manage-courts", lang=lang) }}</a>
         <form method="post" action="/admin/logout" class="inline">