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./themes/your_theme/modules/ps_shoppingcart/modal.tpl variable {$cart_url}

./themes/your_theme/templates/checkout/_partials/cart-detailed-actions.tpl variable {$urls.pages.order}

......

instead of these variables, you can use the function get apge link (if it is a registered link in SEO & URLs).

or possibly a direct link if you don't have a multilingual e-shop.