[docs] [issue26546] Provide translated french translation on docs.python.org

[Julien]

Julien added the comment:

I'm on the way of simplifying my [pull request for docsbuild-script](https://github.com/python/docsbuild-scripts/pull/1) with two goals in mind:

 - Simplify to make it more robust
 - Avoid executing external (~untrusted) Makefile on docs.python.org servers

To achieve this, I need to pass sphinx options to the `Doc/Makefile`, I'd like to call, typically:

    make autobuild-stable SPHINXOPTS='-D language=fr -D locale_dirs=./locale/'

Which work if `Doc/Makefile` don't erase but append to the `SPHINXOPTS` variable. Which is done by `allow_sphinxopts.diff`.

We may simplify it further by adding `locale_dirs` to `Doc/conf.py` which does not break the english build, but I'm not sure if it's of any interest.

We may abstract it further by accepting a new parameter like SPHINXLANG='fr', with a default of 'en', but in every case I think it's a good thing to allow passing arbitrary SPHINXOPTS so let's start with this?

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Added file: http://bugs.python.org/file43865/allow_sphinxopts.diff

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