CafeTran cannot OCR. Instead, you can use Condense ($4.99 in the App Store) to OCR a snippet or any part of your screen:
https://itunes.apple.com/us/app/condense/id715394237?mt=12
Condense is a great tool to quickly OCR the captions in technical drawings! You can create a nice 2-column table in Word with source and target language.
Here is a snippet, a little skewed and damaged:
In this movie you can see how you can use Condense to convert the snippet above to editable text that is placed on your clipboard. Without further ado, you can use CafeTran's Clipboard workflow to translate this text:
For those who cannot stand the terrible auto-translation that Google Translate inserted, here is a better one.