nerf/rails-i18n — comment on commit f74987f9827b76b38b4888f3dd1500510ca40056
File:  line 0
By nerf:

you can see on line 120 'options' is merged with DEFAULT_CURRENCY_VALUES from there we are inheriting the :negative_format => "-%u%n"
https://github.com/rails/rails/blob/master/actionpack/lib/action_view/helpers/number_helper.rb#L120

anyway you can see it for yourself :) get bg.yml and set default locale to :bg