Storyboards: Unescape HTML entities for videojs-vtt-thumbnails

src/invidious/routes/api/v1/videos.cr

@@ -1,3 +1,5 @@
+require "html"
+
 module Invidious::Routes::API::V1::Videos
   def self.videos(env)
     locale = env.get("preferences").as(Preferences).locale
@@ -221,7 +223,7 @@ module Invidious::Routes::API::V1::Videos
     end_time = time_delta - 1.milliseconds
 
     # Build a VTT file for VideoJS-vtt plugin
-    return WebVTT.build do |vtt|
+    vtt_file = WebVTT.build do |vtt|
       sb.images_count.times do |i|
         # Replace the variable component part of the path
         work_url.path = template_path.sub("$M", i)
@@ -239,6 +241,11 @@ module Invidious::Routes::API::V1::Videos
         end
       end
     end
+
+    # videojs-vtt-thumbnails is not compliant to the VTT specification, it
+    # doesn't unescape the HTML entities, so we have to do it here:
+    # TODO: remove this when we migrate to VideoJS 8
+    return HTML.unescape(vtt_file)
   end
 
   def self.annotations(env)