es_MX/MXN: format_currency using comma instead dot for decimal separator

[chronossc]

Hello. I did various tests and found that format_currency is formatting MXN currency (from Mexico, es_MX locale) wrong. There is a small code that compare it to python locale, that use posix data:

In [1]: import locale

In [2]: from babel.numbers import format_currency, Locale

In [3]: locale.setlocale(locale.LC_ALL, 'es_MX.UTF-8')
Out[3]: 'es_MX.UTF-8'

In [4]: locale.localeconv()['int_curr_symbol']
Out[4]: 'MXN '

In [5]: locale.localeconv()['currency_symbol']
Out[5]: '$'

In [6]: locale.localeconv()['decimal_point']
Out[6]: '.'

In [7]: locale.currency(50)
Out[7]: '$ 50.00'

In [8]: format_currency(50, currency='MXN', locale=Locale('es_MX'))
Out[8]: u'50,00\xa0$'

In my tests I updated CLDR data, from 23.1 to 25 and same issue happens.

This can be a issue in CLDR data?

[chronossc]

I found that es_DO, es_GT, es_HN, es_MX, es_NI, es_PA, es_SV are affected.

[etanol]

This is solved in #117. It is caused by not taking into account locale inheritance exceptions. All the spanish variations you mention should be inheriting from es_419 instead of just es.