Swedish adaptation: Instegscertifikat and HAREC content

- Sections and slides rewritten in Swedish; German law and institutions replaced by
  Swedish/CEPT/ITU equivalents (PTS, SSA, PTSFS 2025:1, SSMFS 2008:18), unverified
  statements marked "% TODO VERIFY"
- New toc: INSTEG, HAREC, UPPGRADERING; section idents are Swedish (see ident-map.tsv)
- Exam-question tags, BNetzA question pool, solutions and the German SWL course removed
- Static pages, snippets, applets, READMEs and image alt-texts translated
- TikZ labels translated; SVG drawings regenerated (drawing 689 still fails to build
  upstream: it references a missing photo)
- Changed from the original: not endorsed by DARC e.V., SSA or PTS

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

contents/html/spektrum_sprachsignale.html

@@ -3,16 +3,16 @@
     <script src="https://www.50ohm.de/assets/chartjs/4.4.1/chart.min.js"></script>
 
     <p>
-    Durch Druck auf den nächsten Button, wird das Mikrofon des Browsers
-    aktiviert. Danach kann man das Spektrum der eigenen Sprache betrachten.
+    När du trycker på nästa knapp aktiveras webbläsarens mikrofon.
+    Därefter kan du se spektrumet av din egen röst.
     </p>
     <p>
-        <button onclick="start()">Mikrofon Einschalten</button>
+        <button onclick="start()">Slå på mikrofonen</button>
     </p>
     <p>
         <canvas id="Spectrum" style="max-height:200px;"></canvas>
     </p>
-    Stärkste Amplitude bei der Frequenz $f$ = <div id="mainfrequency" style="display:inline-block;">0</div> $\unit{\hertz}$<br>
+    Starkaste amplitud vid frekvensen $f$ = <div id="mainfrequency" style="display:inline-block;">0</div> $\unit{\hertz}$<br>
 
     <script type="text/javascript">
 
@@ -64,7 +64,7 @@
                         type: 'logarithmic',
                         title: {
                             display: true,
-                            text: 'Frequenz'
+                            text: 'Frekvens'
                         },
                         ticks: {
                             callback: function(val, index) {
@@ -103,7 +103,7 @@
                 audioContext = new AudioContext();
                 binSize = (audioContext.sampleRate) / fftSize; // Bin Size in Hz
             } catch (e) {
-                alert('Die Web Audio API wird in diesem Browser leider nicht unterstützt!');
+                alert('Web Audio API stöds tyvärr inte i den här webbläsaren!');
             }
 
             const update = (timestamp) => {