Swedish adaptation: Instegscertifikat and HAREC

- Editions replaced by INSTEG, HAREC and UPPGRADERING (Instegscertifikat -> HAREC)
- Question pool optional; simulator, homework tool and solutions switch off without one
- All UI strings, templates, renderers and project JS localised to sv-SE
  (decimal comma, Swedish non-breaking-space rules, Å/Ä/Ö in Morse table)
- DARC branding, membership CTA and German links removed; attribution footer added
- Page names centralised in src/pages.py
- README and docs rewritten in Swedish

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

templates/html/kurser-lista.html

@@ -0,0 +1,13 @@
+<nav aria-label="breadcrumb">
+  <ol class="breadcrumb">
+    <li class="breadcrumb-item"><a href="index.html">Hem</a></li>
+    <li class="breadcrumb-item"><a href="index.html#lara">Lär dig</a></li>
+    <li class="breadcrumb-item active" aria-current="page">Kurser</li>
+  </ol>
+</nav>
+
+<h1>{{ snippets.lernen_kurs_title or "Kurser" }}</h1>
+{# TODO: Add a list of courses once the operator has a data source. #}
+<p>{{ snippets.lernen_kurs_teaser or "Här kan du hitta kurser i din närhet." }}</p>
+
+<a class="btn btn-outline-secondary btn-sm px-4 gap-3" href="{{ pages.kurser_karta }}">Kartvy</a>