docs: def make_po_file(self, potfile, locale):
          """
          Creates or updates the PO file for self.domain and :param locale:.
          Uses contents of the existing :param potfile:.
  
          Uses mguniq, msgmerge, and msgattrib GNU gettext utilities.
          """
          pofile = self._get_po_path(potfile, locale)
  
          msgs = self._get_unique_messages(potfile)
          msgs = self._merge_messages(potfile, pofile, msgs)
          msgs = self._strip_package_version(msgs)
  
          with open(pofile, 'w') as fp:
              fp.write(msgs)
  
          self._remove_obsolete_messages(pofile)