The desktop version doesn’t support offline use.
To use the app when offline, it’s crucial that you download the languages you want to translate.
Download for:
pop pop the Google Translate app.

Tap thetranslate fromor thetranslate tolanguage, depending on which one you want to change and/or have downloaded.
A pop-up will appear telling you how much storage you’ll need.
Use the app as you normally would if you were connected to the internet.

How to Delete Languages You’ve Downloaded
TapSettingsin the bottom menu.
On Android, you may need to tap the menu in the top left.
Tap thetrashcanicon to the right of any of your downloaded languages to delete it from your downloads.
Simply tap the update for the corresponding language and follow the steps to get the latest version.