Refactor AccountHelper methods into a LocalizableMessage class

Summary:
AccountHelpers offered methods to prepare a localized message
to print to the console.

We extract them into LocalizableMessage, a fluent class to localize
and transform a message for display.

For convenience, an UserAttribute class is provided for AccountInfo.

Test Plan:

• Run new tests
• ./artisan account:info 1

Reviewers: dereckson

Differential Revision: https://devcentral.nasqueron.org/D512