My new favorite FOSS translation app

Available from F-Droid as Offline Translator.

Originally called Firefox Translator based on the use of the Firefox translation models, Translator is an on-device translation app that has grown by leaps and bounds over this summer.

It includes live image translation, using tesseract OCR and automatic language detection. I've been impressed by how quick and well designed it is since beginning testing. There are many languages available, including non-western scripts.