Thank you for making this toolkit free for us all to look at. I was looking into making a similar (but much less sophisticated) toolkit.
A possible update: The Add Language popup will only let you select from Languages already populated by the developer, ie you cannot "add" a language by typing the language while using the toolkit. It looks like I would need to edit the Language Selector.ctl to add more languages, then reopen the toolkit in LabVIEW to add the language to my project.