i18n: bilingual de/en, bundle js from assets via hugo pipes, css refresh

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

layouts/_default/openbureau.html

@@ -7,7 +7,7 @@
   {{ $total := 1 }}{{ if $rapport }}{{ $total = add $total 1 }}{{ end }}{{ if $dossier }}{{ $total = add $total 1 }}{{ end }}
   <p class="tui__cmd tui__total">total {{ $total }}</p>
   <ul class="tui__ls">
-    <li><a href="{{ "/" | relURL }}" data-name="..">
+    <li><a href="{{ "/" | relLangURL }}" data-name="..">
       <span class="tui__perm">drwxr-xr-x</span><span class="tui__name">..</span>
     </a></li>
     <li><a data-name="info.md" data-text="info.md" class="is-selected">