Update index.html

index.html

@@ -355,7 +355,7 @@
             <button class="control-btn" id="volumeBtn">🔊</button>
             <input type="range" class="volume-slider" id="volumeSlider" min="0" max="1" step="0.01" value="1">
           </div>
-          <button class="control-btn" id="subtitleBtn" title="字幕">📝</button>
+          <button class="control-btn" id="subtitleBtn" title="字幕">🔤</button>
           <button class="control-btn" id="fullscreenBtn">⛶</button>
         </div>
       </div>