Tip: In the Translate app, your saved languages show up as Downloaded . Download languages without Wi-Fi Since language files are small, when you’re not connected to Wi-Fi, you can download them with mobile data. If you don’t use Wi-Fi, it may affect your mobile carrier charges. On your Android phone or tablet, open the Translate app .
https://support.google.com/translate/answer/6142473?hl=en&co=GENIE.Platform%3DAndroid

