In order to automate things, and have forms come up in th eright language, you cna choice th edefault language for a client.
On the customer page, you will find a section called: More Information
In there, it defaults to English. You can choose the language there.
If for some reason the proper language is not chosen when you print the document, if will display the document on the screen. On the upper left hand side, you can choose the proper form and language.
Customer language choice – forms too