Finally, after trying several experimentations, I got my locale in Esperanto with Hardy.
I had forgotten to do: "sudo mv /usr/share/i18n/locales/eo into /usr/share/i18n/locales/eo_XX"
After that, "sudo dpkg-reconfigure locales" created the esperanto locale.
So there is a workaround but hopefully bug can be fixed soon.
Finally, after trying several experimentations, I got my locale in Esperanto with Hardy.
I had forgotten to do: i18n/locales/ eo into /usr/share/ i18n/locales/ eo_XX"
"sudo mv /usr/share/
After that, "sudo dpkg-reconfigure locales" created the esperanto locale.
So there is a workaround but hopefully bug can be fixed soon.