Add option to set all received items to zero

When an order could not be delivered, this option makes it easy to
set all amounts to zero with only one click.

app/views/orders/_edit_amounts.html.haml

@@ -41,6 +41,13 @@
 
     $(document).on('touchclick', '#order_articles .unlocker', unlock_receive_input_field);
 
+    $(document).on('click', '#set_all_to_zero', function() {
+      $('tbody input').each(function(i, input) {
+        $(input).val(0);
+        update_delta(input);
+      });
+    })
+
     $(function() {
       $('input[data-units-expected]').each(function() {
         update_delta(this);
@@ -97,7 +104,10 @@
       = render :partial => 'edit_amount', :locals => {:order_article => order_article}
   %tfoot
     %tr
-      %th{:colspan => 10}
+      %th{colspan: 6}
         %select#add_article{:style => 'width: 500px;'}
           - new_article_data.each do |option|
             %option{id: "add_article_#{option[:id]}", value: option[:id]}= option[:text]
+      %th{colspan: 4}
+        %button.btn#set_all_to_zero{type: :button}
+          = t '.set_all_to_zero'

config/locales/de.yml

@@ -1415,6 +1415,7 @@ de:
       field_unlocked_title: Die Verteilung dieses Artikels auf die einzelnen Bestellgruppen wurde manuell angepasst. Wenn du die gelieferte Menge änderst, werden die vorherigen manuellen Änderungen überschrieben.
     edit_amounts:
       no_articles_available: Keine Artikel zum hinzufügen verfügbar
+      set_all_to_zero: Alle auf Null setzen
     fax:
       amount: Menge
       articles: Artikel

config/locales/en.yml

@@ -1428,6 +1428,7 @@ en:
       field_unlocked_title: The distribution of this article among the ordergroups was changed manually. When you change the amount, those manual changes will be overwritten.
     edit_amounts:
       no_articles_available: No articles to add.
+      set_all_to_zero: Set all to zero
     fax:
       amount: Amount
       articles: Articles