WPML 4.0 version introduced the Advanced Translation Editor, which comes with a built-in machine translation feature.

WPML’s Advanced Translation Editor is a subscription-based service, currently in beta. During this beta period, the service is completely free.

Advanced Translation Editor allows you to use machine translation for translating the whole page at once or field-by-field.

Machine translation feature in the WPML Advanced Translation Editor
Machine translation feature in the WPML Advanced Translation Editor