Thanks for your feedback on this topic. In the latest version of the app (Version 3.1.252) we have added a fix to put offline language packs on the SD card. Please update your app to the latest version and let us know if this works.
Microsoft Translator TeamAndrew Jackson commented
I have a Samsung Galaxy Note8 with a 256 GB SD card and Android 8.0.0. Microsoft Translator uses 1.17 GB on my phone. I have requested 24 times during the past 2 years that the app be modified to allow it to be moved to my SD card.Andrew Jackson supported this idea ·