Since 5425316eff errors when signing up will only display two
messages:
* "Another user is already registered using this email address." or
* "Could not create a new account."
While Odoo creates a multitude of other comprehensible error messages
such as
* "Passwords do not match; please retype them."
* "Signup token '%s' is no longer valid"
This commit now separate UserError and AssertionError from SignupErrors.
Those are still hidden in a general message (see 5425316eff for reasons) while
the other ones are fully displayed.
This commit also improves translations of messages.
Change the label of active state label from Activated to Confirmed. Indeed
it indicates the user logged itself at least once. Active / Inactive is
controlled through the active field. An user that logged once is non labelled
as confirmed.
Denis Vermylen