localization for prompt.Confirm.ask() or override choices attribute

[RenaudBompuis]

Hi,

prompt.Confirm.ask() only seems to allow a Y/N response (unless I'm missing something).

Automatic localization may not be worth the trouble but it would be useful to be able to override the default by exposing the choices member as a parameter so it can be overridden.

For instance:

 prompt.Confirm.ask('Il fait beau ?')

Results in:

 Il fait beau ? [y/n]:

When what I would need is:

 prompt.Confirm.ask('Il fait beau ?', choices=['o', 'n'])

and get:

 Il fait beau ? [o/n]:

Localization in general would be nice, maybe regrouping all error messages and prompts, etc under a single file per language so the appropriate strings can be loaded based on the locale or set to a specific one in code.

Anyway, awesome project!