They are all FILMED in English, but dubbed into many languages. If you go to the San Diego temple, you request a headset, and then listen in the language of choice. If you attend a Spanish session, the language over the speakers is Spanish, and English speakers use the head sets. Same is true for any temple.
Back in my TBM days, they used DVD's. Each DVD had an English track and a few other language tracks so there was a limit on the number of languages that could be accommodated per session.
I think it was 6 or 7 tracks but in European temples like Friedrichsdorf or Zollickhofen, that could still be a problem when they couldn't make the right combination.
Sometimes, I just listened to different languages to make it more interesting. Can you believe we'd go to the temple for a week and do 20 sessions?