Ans: Once you install flits code to your store, please follow below steps for the multi-language option. 

Step 1: Please open Shopify Admin.

Step 2: Select an Online store.

Step 3: Open Themes section.

Step 4: Click on actions section through live theme section & open "Edit language" Section. 

Step 5: You can see below page.

Step 6: Update your language as per your requirements and save it.