module I18n::Backend::Base

for details.
plain Ruby (*.rb) or YAML files (*.yml). See #load_rb and #load_yml
Accepts a list of paths to translation files. Loads translations from

def load_translations(*filenames)
  filenames = I18n.load_path if filenames.empty?
  filenames.flatten.each { |filename| load_file(filename) }
end