I need to automate the language parameter from the Character panel on Illustrator. It is already available for most languages but it looks like the recent languages that have been added in Illustrator are not available for automation. We need to set this up to have the correct hyphenation in the text frames. For example, if we activate the hyphenation for illustrator files that contains Thai strings, it won’t hyphenate the strings correctly until we set the language.

The list available for automation can be found from the Illustrator scripting library on macOS (it contains everything we can use for automation with Illustrator).

You can find it if you follow these steps:
1/ Open Script Editor (installed by default on your Mac)
2/ CMD+SHIFT+L to open the Library
3/ Click on the + button and add Adobe Illustrator 2019 app (/Applications/Adobe\ Illustrator\ CC\ 2019/Adobe\ Illustrator.app/)
4/ Double click Adobe Illustrator 2019 to open the library
5/ Search for the language parameter in the library
6/ It will show the list available for automation (that is different from the list in the UI on Illustrator)

For example Thai, or Hebrew are missing for automation.