This patch allows ox-latex to make a guess on which  language to use
if babel is a default package.  See the head of the patch.

Two notes on the funcion:

1.  As far as I remember, if more than one language is loaded the
order is not neutral one one should issue a \selectlanguage{LANG}.  

2. Perhaps it should look for babel /and/ pologlossya or whatever the
package the xelatex and perhaps lualatex uses.  Any thoughs?

–Rasmus

-- 
Together we'll stand, divided we'll fall