scope_key_by_partial

# File actionpack/lib/action_view/helpers/translation_helper.rb, line 46
        def scope_key_by_partial(key)
          if key.to_s.first == "."
            if @_virtual_path
              @_virtual_path.gsub(%r{/_?}, ".") + key.to_s
            else
              raise "Cannot use t(#{key.inspect}) shortcut because path is not available"
            end
          else
            key
          end
        end