You need to follow these steps in order to localize all custom theme text:
1 Copy all files located in:
2 Create a directory corresponding to your language name and paste all files there:
3 Copy “Stories” language file:
4Translate the copied language files
5Go to Theme CP > Page Builder > Footer area and edit the titles of each Menu content block (at the last row). The “Returns” menu item has a custom label that needs to be changed too.
6Go to Theme CP > Page Builder > Content > All products and edit the titles of the Tabs group.