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]>

assets/script.js

@@ -56,7 +56,7 @@ function answer(el, correct) {
     btn.setAttribute("aria-pressed", on ? "true" : "false");
     btn.classList.toggle("btn-primary", on);
     btn.classList.toggle("btn-secondary", !on);
-    btn.title = on ? "Alles anzeigen" : "Nur Fragen anzeigen";
+    btn.title = on ? "Visa allt" : "Visa endast frågor";
   }
 
   function setQuizMode(on) {
@@ -68,7 +68,7 @@ function answer(el, correct) {
     var btn = document.getElementById("quiz-mode-toggle");
     if (btn) updateButton(btn, on);
     if (on && !hasQ) {
-      showNotice("Keine Fragen auf dieser Seite gefunden.");
+      showNotice("Inga frågor hittades på den här sidan.");
     } else {
       hideNotice();
     }