def METHOD_NAME(filename):
  """Read in constants file, which must be output in every language."""
  constant_defs = read_json_file(filename);
  constants_text = '\n'
  for key in constant_defs:
    value = constant_defs[key]
    value = value.replace('"', '\\"')
    constants_text += '\nBlockly.Msg["{0}"] = "{1}";'.format(key, value)
  return constants_text