Update project description with link to the right Google Cloud API

Problem/Motivation

"Depends on Translation Management Tools. Registration on http://www.google.com is required to use this module."

The above text could be more helpful and ease onboarding onto the awesome functionality this module offers.

Proposed resolution

New text:

• Depends on Translation Management Tools
• Google Cloud Translation API key from https://console.cloud.google.com/marketplace/product/google/translate.go....

Remaining tasks