Google Analytics can show you the langauges used by all visitors have seen your site. To find out, first select Audience.
Now select Demographics, then Location.
The default layout shows the top ten locations that have visited your site. You can change the view to show more results at the bottom right.
To see how many locations have visited a particular page, you need to select that page from the Content list.
Select the page you want to analyze from the list of pages.
With just the desired page displaying in the list, select the Secondary Dimension button.
Under Visitors, select Languages.
The default view will include the top ten locations. You can display more results with the controller on the bottom right.
For a list of country codes, see the ISO Language Reference table.