Bulk removal category on Back-end

I will paid to the one who can make on the Back-end of Prestashop 1.3.1.1 version the following: - Add a "Remove" button on the AdminCatalog screen on the product section, near Reset & Filter buttons - Clicking the button will remove the catagory of the selected products. - If no products selected, message "no product selected" will appear - If succesfull removal of category was made, a message "[n] products has been removed on the category" will appear, where [n] is the number of products selected. Both the original and modified versions of the following files are expected to be delivered: - \admin\tabs\[login to view URL] - \admin\tabs\[login to view URL] - \clases\[login to view URL]