Readable model name with translation support

Use following to have the translated attribute with fallback support,

Person.human_attribute_name("first_name") # => "First name"

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This will look in to the translation in the following order,

	en:
	attributes:
	first_name: First name
	activerecord:
	models:
	person:
	first_name: First name

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First it will look for the "en.activerecord.models.person.first_name" and then for "en.attributes.first_name" and finally falls back to humanize.