Hello,
5. I see that you changed the button with text to icon with q-ty input. So, do you want to change the size of the cart icon?
6) Yes, you are able to translate brands. We don’t have option to add brands to invoice by default.
7) You can find custom CSS in Theme Options > Custom CSS. You can find classed that elements has using Chrome dev tool.
8) It’s because of third-party plugin that you use. Add the below code to Theme Options > Custom CSS to fix the problem
.woocommerce .product span.onsale {
z-index: 3;
}
Regards