Manually extract category refactor from 1b569bbc99207cae7c20aa285f42477ae361dd30

Also fixes some errors caused by cherry-picking

src/invidious/videos.cr

@@ -275,7 +275,7 @@ struct Video
     end
   end
 
-  def to_json(locale, json : JSON::Builder)
+  def to_json(locale : Hash(String, JSON::Any), json : JSON::Builder)
     json.object do
       json.field "type", "video"