Calibredb list does not export languages
I'm using the calibredb list command to export my data to json. While I can export all of my custom fields, I can't export the language field. I get the following error
Invalid fields. Available fields: author_
If I use the 'Create a Catalog' export feature in Calibre GUI, I can export languages, which show up as two letter codes ( ie 'de' for German ), so the data is exportable,but CSV is not as useful to me.
I am using Calibre 2.24.0 on OsX Mavericks