Gmail labs has announced a new feature which can be used to translate your email to your language. All you need is to simply enable “Message Translation” from the Labs tab under Settings and when you receive an email in a language other than your own, Gmail will help you translate it into a language you can understand with just one click.
Once enabled in the labs settings, you can see a link available in the message if the language in the email is anything other than your default language.
The translated message will be available in the same email with an option to change to original text. If you want to translate to any other language from the default language, you will need to change your default language in general settings tab