From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nicolas Goaziou <mail@nicolasgoaziou.fr>
Subject: Re: Possible bug in org-mode (MELPA version as of 1018-11-25) :
 #+language: is not (fully) honored.
Date: Wed, 28 Nov 2018 00:40:43 +0100
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	(emanuel charpentier's message of "Tue, 27 Nov 2018 21:55:57 +0100")
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To: emanuel.charpentier@gmail.com
Cc: emacs-orgmode@gnu.org

emanuel.charpentier@gmail.com writes:

> Le mardi 27 novembre 2018 =C3=A0 21:26 +0100, Nicolas Goaziou a =C3=A9cri=
t :
>
> [ Snip... ]
>
>> What happens if you remove "org-ref.el" reference?
>
> Same thing.
>
> Even after uninstalling org-ref and its dependencies.
>
> Sorry...

OK. I got it. This has nothing to do with LANGUAGE keyword.

Babel is not a default package, per `org-latex-default-packages-alist.
You need to add it to `org-latex-packages-alist'.