WPML Gravity Forms Multilingual Addon Allows translating Gravity Forms. You will be able to create a form in your language and translate it to different languages. No need to maintain several forms, one per language.
nWPML lets you translate the texts that appear in your Gravity Forms to other languages on your site. Once translated, the form displays in the correct language on the front-end automatically.
nYou need the main WPML Multilingual CMS WordPress Plugin. or you can get all WPML plugin + addons from here (WPML Plugin and all Addons Bundle) with low price.