The easiest way to do this will be to create a second set of these Menus with the different font, and swap them in and out as needed by locking them and unlocking the original set.
It will require a little bit of coding, but not much. Assuming you created other Menus for Journal, Menu and Conversation, and added "_OtherFont" to their names, create a C# script named ChangeLLanguageMenus and paste this inside it:
This will cause the Menus to be swapped out whenever the language is changed. It relies on the OnLanguageChange custom event (see this tutorial). All other AC functions used can be found within the scripting guide.
Comments
It will require a little bit of coding, but not much. Assuming you created other Menus for Journal, Menu and Conversation, and added "_OtherFont" to their names, create a C# script named ChangeLLanguageMenus and paste this inside it:
http://paste.ofcode.org/ZdEhATxLighaC3fxk8thKK
This will cause the Menus to be swapped out whenever the language is changed. It relies on the OnLanguageChange custom event (see this tutorial). All other AC functions used can be found within the scripting guide.
http://adventure-creator.wikia.com/wiki/Per-language_Menus