diff --git a/addons/web/i18n/web.pot b/addons/web/i18n/web.pot
index 06166ac4b37..be3979a31b9 100644
--- a/addons/web/i18n/web.pot
+++ b/addons/web/i18n/web.pot
@@ -1503,7 +1503,7 @@ msgstr ""
 #. openerp-web
 #: code:addons/web/static/src/js/views/form_relational_widgets.js:328
 #, python-format
-msgid "No value found for the field  for value "
+msgid "No value found for the field %s for value %s"
 msgstr ""
 
 #. module: web
diff --git a/addons/web/static/src/js/framework/pyeval.js b/addons/web/static/src/js/framework/pyeval.js
index 2b553d37e0f..d0708bdf356 100644
--- a/addons/web/static/src/js/framework/pyeval.js
+++ b/addons/web/static/src/js/framework/pyeval.js
@@ -958,7 +958,7 @@ function eval_arg (arg) {
     case 'context': case 'compound_context':
         return pyeval('contexts', [arg]);
     default:
-        throw new Error(_t("Unknown nonliteral type " + arg.__ref));
+        throw new Error(_t("Unknown nonliteral type ") + ' ' + arg.__ref);
     }
 }
 
diff --git a/addons/web/static/src/js/views/form_relational_widgets.js b/addons/web/static/src/js/views/form_relational_widgets.js
index f1c6e0b36b1..beba85ac512 100644
--- a/addons/web/static/src/js/views/form_relational_widgets.js
+++ b/addons/web/static/src/js/views/form_relational_widgets.js
@@ -325,7 +325,8 @@ var FieldMany2One = common.AbstractField.extend(common.CompletionFieldMixin, com
             var dataset = new data.DataSetStatic(this, this.field.relation, self.build_context());
             var def = this.alive(dataset.name_get([self.get("value")])).done(function(data) {
                 if (!data[0]) {
-                    self.do_warn(_t("Render"), _t("No value found for the field "+self.field.string+" for value "+self.get("value")));
+                    self.do_warn(_t("Render"),
+                        _.str.sprintf(_t("No value found for the field %s for value %s"), self.field.string, self.get("value")));
                     return;
                 }
                 self.display_value["" + self.get("value")] = data[0][1];