Hello Danii,
Thank you for your answer. I have seen this solution on a onther thread but my localized text comes from resource files and if I put the code you see bellow, doesn't work.
<ext:EventEditWindow
ID="EventEditWindow1"
runat="server"
Hidden="true"
GroupStoreID="GroupStore1">
<Listeners>
<Render Handler=" var titleItem = this.formPanel.get('title'),
dateRangeItem = this.formPanel.get('date-range'),
calendarItem = this.formPanel.get('calendar');
titleItem.fieldLabel = '<%$ Resources:MyResource, Title %>';
dateRangeItem.fieldLabel = '<%$ Resources:MyResource, DateRange %>';
calendarItem.fieldLabel = '<%$ Resources:MyResource, Calendar %>';" />
</Listeners>
</ext:EventEditWindow>
Any other idea?
thank you