Drupal Google Translate Module - Must be represented in the url
The only module I know of with a Drupal 7 version is GTranslate.


  GTranslate uses Google power to translate your web page. With 58 available languages your site will be available to more than 98% of internet users.
  
  
  Hides "Suggest better translation" pop-up
  Hides Google top frame after translation
  Mouse over effect
  Analytics feature
  Flags combined in one file to load faster
  Option to open translated page in new window
  Available styles Dropdown/Flags/flags with dropdown
  Valid XHTML
  Google Translate Element on your site (Google Default translation method)
  Ability to use SEF URLs and edit translations with Pro version
  


The module is used from 2250 sites, and 1216 of those are using Drupal 7.

As for the comment written by monymirza, The Google TOS once contained the following paragraph:


  5.3 You agree not to access (or attempt to access) any of the Services by any means other than through the interface that is provided by Google, unless you have been specifically allowed to do so in a separate agreement with Google. You specifically agree not to access (or attempt to access) any of the Services through any automated means (including use of scripts or web crawlers) and shall ensure that you comply with the instructions set out in any robots.txt file present on the Services.


The actual version of the Google TOS says:


  Don't misuse our Services. For example, don't interfere with our Services or try to access them using a method other than the interface and the instructions that we provide. You may use our Services only as permitted by law, including applicable export and re-export control laws and regulations. We may suspend or stop providing our Services to you if you do not comply with our terms or policies or if we are investigating suspected misconduct.


I am not sure what they mean by interface. It could mean you can only access the service through the user interface provided by the browser.