ox-latex.el (latex): Don't force exporting with smart quotes
* ox-latex.el (latex): Don't force exporting with smart
quotes.
* ox.el (org-export-with-smart-quotes): Mention the need to
use the relevant Babel package when setting this option to
non-nil.
Before the fix, if the user used #+LANGUAGE: fr with no other
customization, the quotes would disappear from the PDF output.
That's because smart quotes were enforced, while the .tex file
needs \usepackage[french]{babel} to display the quotes.
We now don't force the smart quotes and give more explanations
in `org-export-with-smart-quotes'.