Fix Fatal error when requesting a translation for content

Given that you have Lang A, B, C, and D.
When you request a translation for content from lang A to Lang B - it works.
And when you request another translation for the same content from lang C to Lang D. Fatal error happens.

Error:

Google\Cloud\Core\Exception\BadRequestException: { "error": { "code": 400, "message": "Invalid Value", "errors": [ { "message": "Invalid Value", "domain": "global", "reason": "invalid" } ] } } in Google\Cloud\Core\RequestWrapper->convertToGoogleException() (line 362 of /app/vendor/google/cloud-core/src/RequestWrapper.php).