Someone on IRC directed me to another page: https://wiki.ubuntu.com/Translations/Wanted/FirefoxDesktop and I followed the instructions there.
It was quite hard to find, and it kind of defeats the point of having a central bug fixing portal, no? -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1225423 Title: Firefox in Ubuntu Unity menu lacks a localised String (NL) Status in “firefox” package in Ubuntu: New Bug description: The firefox.desktop file doesn't contain a localised string for opening a new private window for the Dutch language. It defaults to the English string, while the others are in Dutch. Suggestion: Add Name[nl]=Nieuw privévenster openen to [Desktop Action NewPrivateWindow] Ubuntu version: Release: 13.04 Firefox version: 23.0+build2-0ubuntu0.13.04.1 Expectation: All strings localised What happened instead: Found an English string between Dutch strings To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1225423/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
