I received your email, either it was missing the contents or was in some other language. Now for your query, You can add multiple languages using a popular plugin called WPML. Our theme supports the WPML plugin and the plugin has great set of features and is easy to use. You can also add a language selector for your site in the header, footer or sidebar using this plugin.
Please take a look at this forum post for further assistance
Hope that helps. Thanks!