Okay I just compared with a gutsy VM. Things are the same regarding ubuntu-docs in Gutsy. Only one alternative listed. It instead appears that when you set say a spanish (mexico) locale, that you end up with the homepage in firefox specifically set to file:///usr/share/ubuntu-artwork/home/locales/index-es_AR.html
Reading that spec that mdke posted, these are supposed to be hardcoded into the jar files for each of the locales used.
Okay I just compared with a gutsy VM. Things are the same regarding ubuntu-docs in Gutsy. Only one alternative listed. It instead appears that when you set say a spanish (mexico) locale, that you end up with the homepage in firefox specifically set to file:// /usr/share/ ubuntu- artwork/ home/locales/ index-es_ AR.html
Reading that spec that mdke posted, these are supposed to be hardcoded into the jar files for each of the locales used.