Translating via YouTube:

To access YouTube's built-in translation tool you'll first have to choose a video to work with. Smarter Every Day allows contributions to all videos, but other channels might only allow them for specific ones or not at all.

STEP 1

After entering your selected video's page, click on the gear-shaped button on the bottom right of the player, then on "Subtitles/CC", and finally on "Add subtitles/CC".