Hi, and thank you for your interest!
download.o.o is being translated using Weblate, a web tool designed to ease translating for both developers and translators.
Translation project for download.o.o into Norwegian Nynorsk currently contains 134 strings for translation and is 0.7% complete.
If you would like to contribute to translation of download.o.o, you need to register on this server.
Once you have activated your account just proceed to the translation section.