The Ajax Popup Mini Carts of Shopify Themes sometimes have issues loading the correct translation data.
This is caused because the the mini cart is not requesting the translated versions of product info.
Sometimes the dynamic AJAX calls, such as the one in the mini cart, do not use the translated data. This issue can be solved by the Theme Developer, as the Theme is in control of which translation data to use.
When refreshing the page, after the mini cart has popped up, you may find that it does become fully translated. That is because, after a refresh the data is not loaded with a Dynamic AJAX call, it is loaded on page load.
If you have issues with the Mini Cart not being translated, we suggest reaching out to your Theme Developer, as they can provide a fix to this issue directly.