The 'Site Language' setting affects small pieces of system text that your visitors see in your site's Simple Blog, the Simple Blog subscription feature, Simple Store, and Social feed sections - e.g. "Return to site" button for the blog, "View More" link for the social feed, Simple Store's buyer flow, and email notifications sent to buyers.
** This feature will not change any of the content you've entered!**
Please shoot any questions and feedback over to firstname.lastname@example.org or chat with us. And if you have requests for other languages, please post them in our Idea Forum. Thanks, guys!