Creating training data for a language with a complex name, like ita_old or chi_sim_vert

[Sim Tov]

Hello,

I try to create training data for a language with a complex name similar to ita_old or chi_sim_vert. However when I run the command:

tesstrain.sh --lang eng_old  --fonts_dir ....

I get this error:

=== Starting training for language 'eng_old'
ERROR: Error: eng_old is not a valid language code

How can I cause tesstrain.sh to accept 'eng_old' the way 'ita_old' is accepted?

Thank you in advance!

[Quan Nguyen]

Pick a name that it accepts and then rename the output file to desirable names.