Decimal point in WooCommerce product quantities

I’m using the “Quantities and Units for WooCommerce” plugin to enable decimal quantities and Kg as units in WooCommerce.
I disabled the Enfold +/- as suggested by Josue in his first answer here https://kriesi.at/support/topic/disable-woocommerce-quantity-feature/#post-732609 but this is not sufficient since:
– the quantity field is classified as a Text input field instead of a number input field (as you can see the std increase and decrease HTML buttons are not appearing also in the cart )
– the header cart show quantities with ‘.’ instead of ‘,’
https://drive.google.com/file/d/0B7baurTblFiQQWloLUVmeEJCN2M/view?usp=sharing
https://drive.google.com/file/d/0B7baurTblFiQX0x0X2pwRGF1V1U/view?usp=sharing

So i tried to change the /enfold/config-woocommerce/woocommerce-mod.js to this (only changed parseInt to parseFloat in lines 7,17,22) :

function avia_apply_quant_btn()
	{
		jQuery(".quantity input[type=number]").each(function() {
		var number = $(this),
				max = parseFloat( number.attr( 'max' ) ),
				min = parseFloat( number.attr( 'min' ) ),
				step = parseFloat( number.attr( 'step' ) ),
				newNum = jQuery(jQuery('<div />').append(number.clone(true)).html().replace('number','text')).insertAfter(number);
				number.remove();

			setTimeout(function(){
				if(newNum.next('.plus').length == 0) {
					var minus = jQuery('<input type="button" value="-" class="minus">').insertBefore(newNum),
							plus    = jQuery('<input type="button" value="+" class="plus">').insertAfter(newNum);

					minus.on('click', function(){
						var the_val = parseFloat( newNum.val() ) - step;
						the_val = the_val < 0 ? 0 : the_val;
						the_val = the_val < min ? min : the_val;
						newNum.val(the_val).trigger("change");
					});
					plus.on('click', function(){
						var the_val = parseFloat( newNum.val() ) + step;
						the_val = the_val > max ? max : the_val;
						newNum.val(the_val).trigger("change");

					});
				}
			},10);

		});
	}

In this case, the ‘+’ and ‘-‘ buttons works well, increase and decrease are stepped by 0.5, and the HTML seems to be what i expected:

<form class="cart" method="post" enctype='multipart/form-data'>
	 	<div class="quantity">
	<input type="number" step="0.5" min="0.5" max="" name="quantity" value="1" title="Qtà" class="input-text qty text" size="4" pattern="" inputmode="" />
</div>
	 	<input type="hidden" name="add-to-cart" value="21" />
	 	<button type="submit" class="single_add_to_cart_button button alt">Acquista</button>
</form>

BUT … i get the browser verification error “Respect the required format” on field input (see this: https://drive.google.com/file/d/0B7baurTblFiQZHkyMURxNEVIM2M/view?usp=sharing ).

Can i have your suggestions to solve this empasse?
I need decimal quantities and increase/decrease buttons in input fields (standard html or – better – enfold theme).