The WPML team recently developed MailChimp for WordPress Multilingual that makes it easier to translate content provided by the free MailChimp for WordPress plugin by ibericode.
MailChimp for WordPress Multilingual
It’s a so-called
bridge plugin which is adding an option to translate both MailChimp sign-up forms and messages via WPML. Simply download this plugin from the download section of your account.
In addition, you need to install the following plugins: WPML Multilingual CMS, WPML Translation Management, and WPML String Translation.