Each job can only be set to one language. It is not possible to post the same job in two different languages. If you want to post a job in more than one language, you must duplicate the job and change the language accordingly. Create as many copies of the job as needed to post in the desired languages.
The selected language will be used for all aspects of the candidate’s experience. Things you input manually, such as job descriptions or emails, should be written by you in the relevant language; pre-written job description templates are available in multiple languages.