It turns out that the string is in the gfxboot-theme-ubuntu package, and that it is not set up to be translated. I have committed a fix to my bzr repository, which I will propose for merging.
It turns out that the string is in the gfxboot- theme-ubuntu package, and that it is not set up to be translated. I have committed a fix to my bzr repository, which I will propose for merging.