Hi.
There are two ways of how this could be achieved.
First – use translation plugins like Loco Translate. Install it, select Stripe Payments plugin, select your language and then search for the strings you need to translate. For example, “Product Name:”. Then translate it how you like and save changes. Your translation would be displayed instead of English text (if your site is switched to your language in WP Settings).
Second – create your own “product details” using email merge tags available here: https://s-plugins.com/email-merge-tags-email-shortcodes-email-customization/
Example:
Product Name: {item_name}
Quantity: {item_quantity}
Item Price: {item_price_curr}
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Total Paid: {purchase_amt_curr}First method is preferable as it also translates text for both email and checkout result pages. If you prefer second method, don’t forget to create a custom checkout results page as well using this guide https://s-plugins.com/customize-the-thank-page-message-of-stripe-payments-plugin/