You can now use Google Translate on iPad and iPhone for translation while offline i.e you can now translate words without internet access. As at the time of publishing this post, 52 languages are supported by Google Translate app for offline translation on iPhone and iPad.
Besides that, the mobile app now supports instant camera translation i.e you can use your camera to translate text instantly in 29 languages. 13 new languages have also been introduced to the version 5.0 of the Google Translate for iPhone.
You can check out the list of Google Translate app languages available for camera and offline translation.