language change

Yes its possible to change to any language. You can do this by directly change by filter hook or you can use any multilingual plugin.

add_filter( 'wcptp_price_html', 'wcptp_price_html' );
function wcptp_price_html( $wcptp_price_html ) {
    return str_replace( 'Total Price', 'Order Total', $wcptp_price_html );
}

Replace Order Total to any custom text.
If you need any further assistance please let me know.
Thank you