Support for currencyDecimal

[spookylukey]

Some locales (in fact, currently just one, namely fr_CH) define a currencyDecimal field. This value should be used as the decimal separator, but only for currency values.

babel doesn't use it though:

>>> print(format_currency(12345.678, 'USD', locale='fr_CH'))
12 345,68 $US

The expected output is 12 345.68 $US. Compare with JS Intl.NumberFormat (tested in Firefox and Chrome), which correctly has a . for the decimal separator instead of the ,:

> Intl.NumberFormat("fr-CH", {currencyDisplay:"symbol", style:"currency", currency:"USD"}).format(12345.678)
"12 345.68 $US "

The fix would probably involve passing a decimal_separator keyword argument to NumberPattern.apply, and using this from all branches of format_currency. It looks like the data needed is already available on Locale:

>>> Locale('fr_CH')._data['number_symbols']['currencyDecimal']
'.'

This is the only Locale that has that currencyDecimal key in number_symbols.

[Firefox2005]

+1. I would consider that as a bug. The decimal symbol is correct for other locales but wrong for fr_CH. When using de_CH it returns the correct decimal symbol for Switzerland, which is "."