Integrate Google Translate as match resource 

"Google translate" should be integrated with its payed API service into translate5.

The integration looks pretty simple based on the PHP-client-lib, that is provided by Google.
See here as an example: https://cloud.google.com/translate/docs/reference/libraries#client-libraries-usage-php

No translation of files with Google Translate

As it looks like, Google Translate API offers no functionality to translate complete documents (like SDL languageCloud does). Therefore to support that functionality, we would have to create a translate5 task based on Okapi file parsing on import time, translate every segment with Google and check out the file again - all in the background. For know, we will NOT plan to do that as part of the Google translate integration. Therefore translation of complete files will not be offered in InstantTranslate, if the selected MT engine is Google Translate.