diff --git a/trytond/ir/lang.xml b/trytond/ir/lang.xml
index bb4614f7d6..d40bb653fe 100644
--- a/trytond/ir/lang.xml
+++ b/trytond/ir/lang.xml
@@ -1,25 +1,18 @@
 <?xml version="1.0"?>
-<!-- This file is part of Tryton.  The COPYRIGHT file at the top level of this repository contains the full copyright notices and license terms. -->
+<!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
+this repository contains the full copyright notices and license terms. -->
 <tryton>
     <data>
         <menuitem name="Localization" parent="menu_administration"
             id="menu_localization"/>
 
-        <record model="ir.lang" id="lang_en">
-            <field name="code">en_US</field>
-            <field name="name">English</field>
-            <field name="date">%m/%d/%Y</field>
-            <field name="grouping">[]</field>
-            <field name="decimal_point">.</field>
-            <field name="thousands_sep">,</field>
-        </record>
-        <record model="ir.lang" id="lang_fr">
-            <field name="code">fr_FR</field>
-            <field name="name">Français</field>
-            <field name="date">%d.%m.%Y</field>
-            <field name="grouping">[]</field>
+        <record model="ir.lang" id="lang_cs">
+            <field name="code">cs_CZ</field>
+            <field name="name">Čeština</field>
+            <field name="date">%-d.%-m.%Y</field>
+            <field name="grouping">[3, 3, 0]</field>
             <field name="decimal_point">,</field>
-            <field name="thousands_sep"></field>
+            <field name="thousands_sep"> </field>
         </record>
         <record model="ir.lang" id="lang_de">
             <field name="code">de_DE</field>
@@ -29,6 +22,14 @@
             <field name="decimal_point">,</field>
             <field name="thousands_sep">.</field>
         </record>
+        <record model="ir.lang" id="lang_en">
+            <field name="code">en_US</field>
+            <field name="name">English</field>
+            <field name="date">%m/%d/%Y</field>
+            <field name="grouping">[]</field>
+            <field name="decimal_point">.</field>
+            <field name="thousands_sep">,</field>
+        </record>
         <record model="ir.lang" id="lang_es">
             <field name="code">es_ES</field>
             <field name="name">Español</field>
@@ -37,6 +38,14 @@
             <field name="decimal_point">,</field>
             <field name="thousands_sep"></field>
         </record>
+        <record model="ir.lang" id="lang_fr">
+            <field name="code">fr_FR</field>
+            <field name="name">Français</field>
+            <field name="date">%d.%m.%Y</field>
+            <field name="grouping">[]</field>
+            <field name="decimal_point">,</field>
+            <field name="thousands_sep"></field>
+        </record>
 
         <record model="ir.ui.view" id="lang_view_tree">
             <field name="model">ir.lang</field>
diff --git a/trytond/web_service/db.py b/trytond/web_service/db.py
index a708a14660..212ada819a 100644
--- a/trytond/web_service/db.py
+++ b/trytond/web_service/db.py
@@ -1,4 +1,5 @@
-#This file is part of Tryton.  The COPYRIGHT file at the top level of this repository contains the full copyright notices and license terms.
+#This file is part of Tryton.  The COPYRIGHT file at the top level of
+#this repository contains the full copyright notices and license terms.
 # -*- coding: utf-8 -*-
 import logging
 import threading
@@ -256,8 +257,9 @@ class DB(Service):
 
     def list_lang(self):
         return [
+            ('cs_CZ', 'Čeština'),
             ('de_DE', 'Deutsch'),
             ('en_US', 'English'),
-            ('fr_FR', 'Français'),
             ('es_ES', 'Español'),
+            ('fr_FR', 'Français'),
         ]