docs: def add_plugins(self, page, placeholder):
          """
          Add a "TextPlugin" in all languages.
          """
          for language_code, lang_name in iter_languages(self.languages):
              for no in range(1, self.dummy_text_count + 1):
                  add_plugin_kwargs = self.get_add_plugin_kwargs(
                      page, no, placeholder, language_code, lang_name)
  
                  log.info(
                      'add plugin to placeholder "%s" (pk:%i) in: %s - no: %i',
                      placeholder, placeholder.pk, lang_name, no)
                  plugin = add_plugin(
                      placeholder=placeholder,
                      language=language_code,
                      **add_plugin_kwargs)
                  log.info('Plugin "%s" (pk:%r) added.', str(plugin), plugin.pk)
                  placeholder.save()