internationalisation fr:en

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-    <div class="kicker">user manual · rev. 2.4 &nbsp;·&nbsp; <a href="tuto.html" style="color:var(--accent);text-decoration:none;border-bottom:1px solid var(--accent)">Version française</a></div>
+    <div class="kicker">user manual · rev. 2.5 &nbsp;·&nbsp; <a href="tuto.html" style="color:var(--accent);text-decoration:none;border-bottom:1px solid var(--accent)">Version française</a></div>
     <h1><em>_chordlab</em></h1>
     <p>A chord and progression machine. The whole idea fits in one sentence: <strong>you don't play the notes of a chord, you describe it</strong> — a root, a type, some tensions — and the machine takes it from there, all the way to your synths or your DAW.</p>
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       <figcaption>fig. 1 — front panel map</figcaption>
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+    <p>The app header carries an <strong>FR / EN</strong> switch that flips the whole interface: labels, dropdowns, buttons, tooltips and messages. The language is detected at startup from your browser and stored in <code>.json</code> sessions. Musical vocabulary — chord names, types, tensions, performance modes — stays the same in both languages.</p>
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-  <footer>_chordlab · manual rev. 2.4 · underscorelab / leradiologue</footer>
+  <footer>_chordlab · manual rev. 2.5 · underscorelab / leradiologue</footer>
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