Google Translate supports offline translation.

Google Translate is one of those apps that I do not use heavily, being bi-lingual. But it did prove itself useful at times. However, it was utterly useless when no data connection was available, thus rendering Google Translate frustrating. That has changed now with the update that was published to Google Play that brings offline mode to Google Translate. All that is required is to download the language packs you need to do translation on the go with or without internet and not get lost in translation. Of course, Google Play, loke any other Google apps for Android, is free.