I didn't found in smartGWT any method to set standard dialog buttons titles, except of this:
May be, sjivan can add wrappers for this in next build of smartGWT?
Code:
private native void setI18n() /*-{
$wnd.isc.Dialog.YES_BUTTON_TITLE="Да";
$wnd.isc.Dialog.NO_BUTTON_TITLE="Нет";
}-*/;
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