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Today, if I need to change the language of NetBeans, I have only one option. I have to change netbeans.conf file, adding "–locale". Maybe you could add an option inside the NetBeans IDE, like in Tools / Options / Miscellaneous. This kind of option is becoming normal for most of the multilingual softwares these days. I originally posted a problem with the website (changing the website language, doesn't redirected to download the installation in the correct language), but Tomas Korinek suggested me to post it as a "enhancement issuezilla"
Reassigning to "core".