[issue16555] Add es_cu to locale library.

[Leiser Fernández Gallo]

Leiser Fernández Gallo added the comment:

In the file locale.py there is a var locale_alias that map the locale names, es_cu isn't there.

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versions: +Python 2.7 -Python 3.4

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<http://bugs.python.org/issue16555>
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