diff --git a/addons/website_sale_options/controllers/main.py b/addons/website_sale_options/controllers/main.py
index f2b53d84fb9..95e981fe77c 100644
--- a/addons/website_sale_options/controllers/main.py
+++ b/addons/website_sale_options/controllers/main.py
@@ -23,8 +23,11 @@ class website_sale_options(website_sale):
         return r
 
     @http.route(['/shop/cart/update_option'], type='http', auth="public", methods=['POST'], website=True)
-    def cart_options_update_json(self, product_id, add_qty=1, set_qty=0, goto_shop=None, **kw):
+    def cart_options_update_json(self, product_id, add_qty=1, set_qty=0, goto_shop=None, lang=None, **kw):
         cr, uid, context, pool = request.cr, request.uid, request.context, request.registry
+        if lang:
+            context = dict(context, lang=lang)
+            request.website = request.website.with_context(context)
 
         order = request.website.sale_get_order(force_create=1)
         product = pool['product.product'].browse(cr, uid, int(product_id), context=context)
@@ -57,11 +60,13 @@ class website_sale_options(website_sale):
         if not context.get('pricelist'):
             context['pricelist'] = int(pricelist)
 
+        website_context = kw.get('kwargs', {}).get('context', {})
+        context = dict(context or {}, **website_context)
         from_currency = pool.get('product.price.type')._get_field_currency(cr, uid, 'list_price', context)
         to_currency = pricelist.currency_id
         compute_currency = lambda price: pool['res.currency']._compute(cr, uid, from_currency, to_currency, price, context=context)
-
         product = pool['product.product'].browse(cr, uid, int(product_id), context=context)
+        request.website = request.website.with_context(context)
 
         return request.website._render("website_sale_options.modal", {
                 'product': product,
diff --git a/addons/website_sale_options/static/src/js/website_sale.js b/addons/website_sale_options/static/src/js/website_sale.js
index 871babd6550..2b8c042005b 100644
--- a/addons/website_sale_options/static/src/js/website_sale.js
+++ b/addons/website_sale_options/static/src/js/website_sale.js
@@ -27,6 +27,7 @@ $(document).ready(function () {
                         var $a = $(this);
                         $form.ajaxSubmit({
                             url:  '/shop/cart/update_option',
+                            data: {lang: openerp.website.get_context().lang},
                             success: function (quantity) {
                                 if (!$a.hasClass('js_goto_shop')) {
                                     window.location.href = window.location.href.replace(/shop([\/?].*)?$/, "shop/cart");