As of today, I note that the #+langiage export variable is no longer
honored when exporting to LaTeX/PDF. See enclosed files :

- #+language:fr should get me a table of contents entitled "Table des 
  matières" ;

- #+ the Latex file has "pdflang={Frenchb}}" in a \hypersetup call, 
  but nothing even remotely babel-related (i. e. nothing related to the
  LaTeX package babel, which isn't loaded...)

- the PDF file has a table of contents entitled "Contents".

HTH,

--
Emmanuel Charpentier