http://netbeans.org/bugzilla/show_bug.cgi?id=133901 (vote for them)
After you have build your zip-distribution (or jnlp distribution), you need to copy
the following libraries from your netbeans installation into corresponding locations in your application:
You also have to edit your .conf file located in your_app/etc/your_app.conf
find default_options and add this: -J-Duser.language=sv --locale sv (change sv to your locale setting).
All of the above is automated with Ant and only applicable if you have the original IDE with your desired locale to begin with...
To enable locale translations in zip builds and jnlp builds I ended up using the build in
support for Branding. Here you can enter your own values to pretty much any property-file
in your project. And the locale data is stored in files accessible here.
However, entering all those translations here just isn't a realistic option so what I did was that I
changed one or two properties here so that I could see what and how this changed was
stored in my project. It turned out that it is stored in file and directory hierarchy much similar
to how the localized jars are stored.
So, what I did was this:
I downloaded the platform locale project from http://hg.netbeans.org/main/l10n/ using Mercury.
From there I chose the sv branch since I'm interested in the swedish locale. Then I copied
the each sub directory corresponding to the jar I was wanting to translate into the projects
branding directory. After copy there was two things that had to be done:
1) rename the top directory (add ".jar" to its name)
2) rename the Bundle_sv.properties file that contains the translations.
This all may sound complicated but in reality was quite simple
(but it took about 1.5 hours to do it manually for my project). Take a look at the branding tool
and what it does when you change a value in one of the properties (it's browsable in the
branding directory in the Files tab of your project) if you need a hand.
And just like that, you have locale data build in to you zip and jnlp builds!