Offline translation files not recognized
In the file browser, at e.g. .../r11, Select All and choose Move, and move them to the similar path on internal memory (which works out to be /storage/emulated/0/Android/data/com.google.android.apps.translate/files/olpv3/v5/25/r11) and also move the other revisions (e.g. .../r12 on the SD card to .../r12 on internal memory).  The app itself can still be running on the SD card, but for some reason it can't find the offline translation files there.