smart quotes and languages like en-gb

[Rasmus]

Hi,

I have noticed that smart quotes are not picked up for “long” languages,
like “en-gb”, since smart quotes are defined for “short” languages, like
“en”, in org-export-smart-quotes-alist.

The attached patch is an attempt at remedying this.  Not sure if it is the
best fix, though...

Test file:

    #+language: en-gb
    "Foo"

Thanks,
Rasmus

-- 
Dung makes an excellent fertilizer

0001-org-export-activate-smart-quotes-Support-languages-w.patch
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