Apple Watch lets you translate your conversations in real-time. Here's how

Normally, the Translate app handles the translations online. But you may run into spots with weak or no internet access. In that case, you’ll want to download a language ahead of time so you can use it offline.

Before running the downloads, ensure you’re on a Wi-Fi network with a good connection. Then tap the option for Downloaded Languages. On the next screen, choose each language you wish to download. The app supports Arabic, Chinese Mandarin, Dutch, English, French, German, Indonesian, Italian, Korean, Polish, Portuguese, Russian, Spanish, Thai, Turkish, Ukrainian, and Vietnamese. 

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Back at the previous screen, you can turn on the switch for On-Device Mode if you want the translations to work offline with the downloaded languages. However, this prevents you from using any languages you haven’t downloaded.