The source of this problem - eo locales does not created when esperanto support gets enabled.
To fix it I added names of all available esperanto locales (from /usr/share/i18n/SUPPORTED) to the /var/lib/locales/supported.d/eo file.
It is just 3 lines:
eo.UTF-8 UTF-8
eo ISO-8859-3
eo_US.UTF-8 UTF-8
Then I ran locale-gen command to generate required locales and it worked fine.
After that I got possibility to choose esperanto language in GDM and/or start any program with esperanto locale using commands like "LC_ALL=eo cal" etc.
The source of this problem - eo locales does not created when esperanto support gets enabled.
To fix it I added names of all available esperanto locales (from /usr/share/ i18n/SUPPORTED) to the /var/lib/ locales/ supported. d/eo file.
It is just 3 lines:
eo.UTF-8 UTF-8
eo ISO-8859-3
eo_US.UTF-8 UTF-8
Then I ran locale-gen command to generate required locales and it worked fine.
After that I got possibility to choose esperanto language in GDM and/or start any program with esperanto locale using commands like "LC_ALL=eo cal" etc.
Hope this helps.