Use windows compatible date format by default

trytond/ir/lang.xml

@@ -9,7 +9,7 @@ this repository contains the full copyright notices and license terms. -->
         <record model="ir.lang" id="lang_cs">
             <field name="code">cs_CZ</field>
             <field name="name">Czech</field>
-            <field name="date">%-d.%-m.%Y</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>