custom JS removed in favor of proper CSRF implementation

assets/views/partials/settings_dropdown.html

@@ -20,6 +20,7 @@
   class="absolute right-0 mt-2 flex w-56 flex-col overflow-hidden rounded-radius border border-outline bg-surface-alt py-1 shadow-lg dark:border-outline-dark dark:bg-surface-dark-alt"
   role="menu">
   <form method="post" action="/lang" hx-boost="false">
+  <input type="hidden" name="_csrf" value="{{ csrf_token() }}">
     <p class="px-4 py-1.5 text-xs font-semibold uppercase tracking-wide text-on-surface/60 dark:text-on-surface-dark/60">
       {{ t(key="settings-language", lang=lang | default(value='sk')) }}
     </p>