I once visited the Fremont factory for a week and was required to do safety training. The person went on about how the training is only in English and you must know English to complete it. He had everyone say hi and something about themselves and about 1/3 didn’t speak any English. He just decided to keep going anyways and everyone completed safety training.
I’m not sure how typical that is in the industry. I wouldn’t be surprised to learn that it’s totally normal.