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/about.html

@@ -5,7 +5,7 @@
   <p class="tui__cmd"><span class="tui__sym">$</span> ls</p>
   <p class="tui__cmd tui__total">total {{ if $cv }}2{{ else }}1{{ end }}</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">