Sets the untranslate columns.
(e.g.) Person < ActiveRecord::Base untranslate :age, :address end
Returns true if the column is set "untranslate".
(e.g.) untranslate? :foo
Untranslate all of the tablename/fieldnames in this model class.
(e.g.) Person < ActiveRecord::Base untranslate_all end
Returns true if "untranslate_all" is called. Otherwise false.
[Validate]