1 files changed, 8 insertions, 1 deletions
diff --git a/addons/web_planner/static/src/js/web_planner_common.js b/addons/web_planner/static/src/js/web_planner_common.js
index 0e611c89655..2ffce7df71d 100644
--- a/addons/web_planner/static/src/js/web_planner_common.js
+++ b/addons/web_planner/static/src/js/web_planner_common.js
@@ -67,11 +67,18 @@ var PlannerDialog = Dialog.extend({
      * Fetch the planner's rendered template
      */
     willStart: function() {
+        var context = session.user_context;
+        // fallback context for frontend
+        if(_.isEmpty(context)) {
+            context = {
+                lang: (document.documentElement.getAttribute('lang')||'').replace('-', '_'),
+            };
+        }
         var def = rpc.query({
                 model: 'web.planner',
                 method: 'render',
                 args: [this.planner.view_id[0], this.planner.planner_application],
-                context: session.user_context,
+                context: context,
             })
             .then((function (template) {
                 this.$template = $(template);