Model plural label fix: Count must be 'other' to apply :other key with every locale. 

Two for count doesn't apply right plural key (:other) for some languages.
For example, in russian locale it calls :few key and applies wrong translation.

     >> I18n.locale = :ru
     >> I18n.t 'activerecord.models.user', count: 2
     => "Пользователя"  #wrong
     >> I18n.t 'activerecord.models.user', count: 'other'
     => "Пользователи"  #right
     >> I18n.t.locale = :en 
     => I18n.t 'activerecord.models.user', count: 'other'
     => "Users"