When you create a new push or in-app campaign, the editor allows you to create notifications in several languages. 

You can add languages, clicking on "+". Batch will automatically send the message in the right language to every targeted users.

Default Language
1- If you are sending a campaign in one single language, you can write your push directly on the first tab, even if the language is not corresponding. 

For instance, as shown above, I can write my push in English even if French is set as the default language. Since it's only one push, the latter is my "default" message.  

2- If you are sending a campaign written in different languages, choose one default language, then create many notifications in other languages.
Batch will deliver the message in the default language if you don’t have a message in the language of a user.

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