Layout-Umbauten:

- Standartisierung der Karten-/Template-Elemente (schließt #224)
- Verbesserung einiger Ansichten
- "schrumpfung"
- Code-Cleanups
- Trabsliteration Kategorien
u. v. m.

layouts/partials/filter-controls.html

@@ -0,0 +1,21 @@
+<div class="row gta-cat">
+  <div class="col-lg-12">
+    <ul class="list-inline text-center filter-controls mb-5">
+      <li class="list-inline-item m-3 text-uppercase active" data-filter="all">{{ i18n "all" }}</li>
+      {{ $categories := slice }}
+      {{ range .Data.Pages }}
+        {{ $categories = $categories | append .Params.category }}
+      {{ end }}
+      {{ range ( $categories | uniq ) }}
+        <li class="list-inline-item m-3 text-uppercase" data-filter="{{ . | urlize }}">{{ . | humanize }}</li>
+      {{ end }}
+    </ul>
+  </div>
+</div>
+<noscript>
+  <style>
+    .gta-cat {
+      display: none;
+    }
+  </style>
+</noscript>