updated scraping to make subtitles work again

Hi.
I updated the scraping of "talkId" and "introDuration" to make it work with the current TED website.
Don't know how long has been since the website changed. I know last week TED changed the website a bit, 'cause an iOS app I use got broken and had to be updated to fix the parsing.

UPDATE:
Also fixed the form filling code. Authentication works again. "Favorites" opens again.