[docs] [issue12726] explain why locale.getlocale() does not read system's locales

[Éric Araujo]

Changes by Éric Araujo <merwok at netwok.org>:


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nosy: +docs at python, eric.araujo
stage:  -> needs patch
versions: +Python 2.7, Python 3.2, Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12726>
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