WPML makes it easy to translate Gravity Forms, using the Gravity Forms Multilingual glue plugin. Gravity Forms Multilingual will show Gravity Forms in WPML's Translation Dashboard. You can select forms and send to translation, just like any other WordPress content. This way, you can manage the forms only in the default language and forms will appear translated, when inserted into translated content. To use Gravity Forms Multilingual, you need to have WPML's Translation Management and String Translation modules activated.