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