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]>

test/test_unit.py

@@ -14,7 +14,7 @@ def test_basic_units_html():
         "1 Ah": "1 Ah",
         "10 A/mm²": "10 A/mm²",
         "DL9MJ": "DL9MJ",  # Ensure other strings, like callsings, aren‘t mistaken for units. ;)
-        "Ein Satz mit 200 V.": "Ein Satz mit 200 V.",  # Support units before sentence ends.
+        "En mening med 200 V.": "En mening med 200 V.",  # Support units before sentence ends.
     }
 
     for input, output in assertions.items():
@@ -35,10 +35,10 @@ def test_translated_units_html():
 
 @pytest.mark.html
 def test_special_units_html():
-    """Test special units: Don't put space before ° and %."""
+    """Test special units: Don't put space before °; % gets a thin space (Swedish convention)."""
     assertions = {
-        "100%": "100%",
-        "100 %": "100%",
+        "100%": "100 %",
+        "100 %": "100 %",
         "42,24°": "42,24°",
     }