When I try to use Google Translate offline, I get an error:
Translation failed. Offline translation file not available. Please check SD card is inserted.
In Settings-> Storage I could see that the Translate app was stored in the phone's internal memory. I tried moving it to the SD card, and even after restarting the device, the same error was still there.
Using a file browser, I am able to look at the SD card and see that
/storage/extSdCard/Android/data/com.google.android.apps.translate/files/olpv3/v5/25/r11 contains folders like
lang.pt_en where "pt" is also replaced by some other two-letter language codes.
.../r12 contains the files for French.
How do I get Translate to work?