diff --git a/kfet/templates/kfet/history.html b/kfet/templates/kfet/history.html
index 01aaa359..97a0e413 100644
--- a/kfet/templates/kfet/history.html
+++ b/kfet/templates/kfet/history.html
@@ -62,6 +62,8 @@
 $(document).ready(function() {
     settings = { 'subvention_cof': parseFloat({{ settings.subvention_cof|unlocalize }})}
 
+    lock = 0 ;
+
     khistory = new KHistory();
 
     var $from_date = $('#from_date');
@@ -166,7 +168,10 @@ $(document).ready(function() {
 
     function confirmCancel(opes_to_cancel) {
         var nb = opes_to_cancel.length;
-        var content = nb+" opérations vont être annulées";
+        var content = nb+' opération'.pluralize(nb)
+                        +' va'.pluralize(nb, ' vont')
+                        + ' être'
+                        + ' annulée'.pluralize(nb);
         $.confirm({
             title: 'Confirmation',
             content: content,
@@ -180,50 +185,10 @@ $(document).ready(function() {
         });
     }
 
-    function requestAuth(data, callback) {
-        var content = getErrorsHtml(data);
-        content += '<input type="password" name="password" autofocus>',
-        $.confirm({
-            title: 'Authentification requise',
-            content: content,
-            backgroundDismiss: true,
-            animation:'top',
-            closeAnimation:'bottom',
-            keyboardEnabled: true,
-            confirm: function() {
-                var password = this.$content.find('input').val();
-                callback(password);
-            },
-            onOpen: function() {
-                var that = this;
-                this.$content.find('input').on('keypress', function(e) {
-                    if (e.keyCode == 13)
-                        that.$confirmButton.click();
-                });
-            },
-        });
-    }
-
-    function getErrorsHtml(data) {
-        var content = '';
-        if ('missing_perms' in data['errors']) {
-            content += 'Permissions manquantes';
-            content += '<ul>';
-            for (var i=0; i<data['errors']['missing_perms'].length; i++)
-                content += '<li>'+data['errors']['missing_perms'][i]+'</li>';
-            content += '</ul>';
-        }
-        if ('negative' in data['errors']) {
-            var url_base = "{% url 'kfet.account.update' LIQ}";
-            url_base = base_url(0, url_base.length-8);
-            for (var i=0; i<data['errors']['negative'].length; i++) {
-                content += '<a class="btn btn-primary" href="'+url_base+data['errors']['negative'][i]+'/edit" target="_blank">Autorisation de négatif requise pour '+data['errors']['negative'][i]+'</a>';
-            }
-        }
-        return content;
-    }
-
     function cancelOperations(opes_array, password = '') {
+        if (lock == 1)
+            return false
+        lock = 1 ;
         var data = { 'operations' : opes_array }
         $.ajax({
             dataType: "json",
@@ -239,6 +204,7 @@ $(document).ready(function() {
         })
         .done(function(data) {
             khistory.$container.find('.ui-selected').removeClass('ui-selected');
+            lock = 0 ;
         })
         .fail(function($xhr) {
             var data = $xhr.responseJSON;
@@ -252,6 +218,7 @@ $(document).ready(function() {
                     displayErrors(getErrorsHtml(data));
                     break;
             }
+            lock = 0 ;
 
         });
     }