General theme: add license and add URL source code in footer

youtube/templates/watch.html

@@ -76,21 +76,7 @@
 
             <div class="external-player-controls">
                 <input class="speed" id="speed-control" type="text">
-                <script>
-                 (function main() {
-                     'use strict';
-                     const video = document.getElementById('js-video-player');
-                     const speedInput = document.getElementById('speed-control');
-                     speedInput.addEventListener('keyup', (event) => {
-                         if (event.key === 'Enter') {
-                             let speed = parseFloat(speedInput.value);
-                             if(!isNaN(speed)){
-                                 video.playbackRate = speed;
-                             }
-                         }
-                     });
-                 }());
-                </script>
+                <script src="/youtube.com/static/js/speedyplay.js"></script>
             </div>
 
             <input class="v-checkbox" name="video_info_list" value="{{ video_info }}" form="playlist-edit" type="checkbox">
@@ -184,6 +170,7 @@
                 </nav>
                 {% if playlist['current_index'] is not none %}
                     <script>
+                     // @license magnet:?xt=urn:btih:0b31508aeb0634b347b8270c7bee4d411b5d4109&dn=agpl-3.0.txt AGPL-v3-or-Later
                      (function main() {
                          // from https://stackoverflow.com/a/6969486
                          function escapeRegExp(string) {
@@ -260,10 +247,12 @@
                              }
                          }
                      }());
+                     // @license-end
                     </script>
                 {% endif %}
                 {% if playlist['id'] is not none %}
                     <script>
+                     // @license magnet:?xt=urn:btih:0b31508aeb0634b347b8270c7bee4d411b5d4109&dn=agpl-3.0.txt AGPL-v3-or-Later
                      (function main() {
                          // lazy load playlist images
                          // copied almost verbatim from
@@ -296,6 +285,7 @@
                              observer.observe(img);
                          });
                      }());
+                     // @license-end
                     </script>
                 {% endif %}
             </div>