Make all account names human readable

[varkum]

Fixed the above two names in the form to the following:

I converted the type_name method to a class method. To me, it makes more sense to pass the class in the type local for the _account_type partial instead of instantializing each type just to access the type_name. It also eliminates the need to call .class then on every instance of the type in the partial.

[varkum]

Is there a way to use a safe constantize here? We have to either rely on the accountable_type model attribute or the query param, both of which are marked as unsafe by scan_ruby

[ricsdeol]

I think this coukd be closed after #256

[Shpigford]

A lot of changes to the add account flow so going to close this.