Exception handler using Translates storage class

We have loads of small texts in one of our applications so maintaining the default_locale yml became labor intensive. Hence I wrote this short fragment and put it in lib/.

It will rescue the MissingTranslationData exception and look up the default_locale. If a translation is nonexistent it will insert a proper key:value pair in the default_locale yml using Translates storage class. The missing translation will then be visible in the Translate GUI.

def exception_handler(exception, locale, key, options) 
  if I18n::MissingTranslationData === exception
    if locale == I18n.default_locale
      # The translation has failed being looked up in the default_locale yml.
      # This happens whenever translated strings have been added in the application without 
      # adding a corresponding key:value pair in the default_locale yml
      # The following lines uses the Translate plugins functionality to create the missing 
      # key:value pairs for default_locale and store the yaml 
      I18n.backend.store_translations(I18n.default_locale, get_i18n_hash(options[:scope], key))
      Translate::Storage.new(I18n.default_locale).write_to_file
      I18n.backend.send(:init_translations)
      return key
    else
      # Translation has not yet been added to the chosen locale. Look up default_locale
      return I18n.t key, :locale => I18n.default_locale, :scope => options[:scope]
    end
  else
    raise exception
  end
end 

# Convert something like:
# 
#  get_i18n_hash([:controllers, :profile], "Releases")
# 
# to:
# 
# {
#  :controllers => {
#    :profile => {
#      "Releases" => "Releases"
#    }
#   }
# }
def get_i18n_hash(scope, value)
  res = {value => value} 
  return res if scope.nil?
  scope = [scope] if !scope.is_a? Array
  res = scope.reverse.inject({value => value}) { |result, key| {key => result} }
  res
end

I18n.exception_handler = :exception_handler