Hello,
The product page may have 3 Additional tabs.
1. Provided by Basel globally, configured in Theme Settings > Product page
2. Next Additional tab is provided in the Product page settings: https://xtemos.com/docs/basel/product-page-options-2/ this tab appears individually on each product.
3. Additional tab provided by Woocommerce, it contains attributes assigned to the product. The title of the tab is translated in Loco > Plugins > Woocommerce.
Attributes are not translated in Loco, it is necessary to create the attributes from scratch if you need to change them.
If you have any questions please let me know.
Best Regards