Update: Thanks to some pointers from Derick Rethans the locale is now complete and up on the eZ site.
I'm in the process of doing a spring clean and came across an Indonesian locale that I created for a multilingual project we completed some time ago: http://www.universitasaustrali.com.au/
The locale in incomplete in that I have not been able to establish the short names for days and months. It's good enough to use for most cases (not sure where and if the short names actually get used) and have released it as a contribution:
If anyone can help to complete it please drop me a line.