docs: def template_substitute(text, **kwargs):
      """
      Replace placeholders in text by using the data mapping.
      Other placeholders that is not represented by data is left untouched.
  
      :param text:   Text to search and replace placeholders.
      :param data:   Data mapping/dict for placeholder key and values.
      :return: Potentially modified text with replaced placeholders.
      """
      for name, value in kwargs.items():
          placeholder_pattern = "{%s}" % name
          if placeholder_pattern in text:
              text = text.replace(placeholder_pattern, value)
      return text