BUG Re: [PATCH] ox-latex.el: Unify in one single list Babel and Polyglossia languages alists

[Kai von Fintel]

I believe that that this patch has made it impossible to export to latex, 
because the function =org-latex--format-spec= in =ox-latex.el= still refers to 
the old variables, which are now not bound:

> Debugger entered--Lisp error: (void-variable org-latex-babel-language-alist)
>  org-latex--format-spec(

etc.

— Kai.