You want to deploy mapped drives only to users who have French configured as their local language. What feature of Group Policy preferences allows you to do this?
Quick check answer
You can use item-level targeting with Language targeting selected.
The above tip was excerpted from Mitch Tulloch's book Training Guide: Installing and Configuring Windows Server 2012 from Microsoft Press.
Mitch is a ten-time recipient of the Microsoft Most Valuable Professional (MVP) award and a widely recognized expert on Windows Server and cloud computing technologies. For more information see http://www.mtit.com.