Add to Cart Woocommerce issue

Hi guys!

here is an example of my shop homepage: http://www.discountfriends.net/

If you go over the tablets products under the large picture you get the option to either see the detail of the product or add to cart. When you chose add to cart, the products just load continuously and doesnt add it to the card. If you let load and go on another page, it then shows it in the cart.

If you add the product to cart from the category page (tablets too for instance) it works properly.

Can you please have a look?

and by the way, how can i change the text of the options “add to cart” or “see product details”? I would like to have them in french.

Thanks for your help!
Patrick