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first I have tried to change /module/build/launcher/etc/module.conf. It didn't work. then I searched for "change locale for a netbeans module suite" and found http://wiki.netbeans.org/wiki/view/TranslateNetbeansModule I added run.args.extra=--locale en to project.properties and it worked. Just let the user enter default locale in the properties dialog for a module suite!
*** This issue has been marked as a duplicate of 64618 ***
ok