The problem with WF is, however, that so far there's no field in the software to paste in the code you receive from Google. Now they charge $20 per 1M characters, as far as I remember.
This will be addressed in WFP 2.4.4 which should be released in the next week or so. This version will allow you to enter your API key if you have chosen to pay for Google Translate. I will notify this forum when the new version is available for download.