code: def make_header(self, locale, catalog):
          
          return {
              "po-revision-date": self.get_catalogue_header_value(catalog, 'PO-Revision-Date'),
              "mime-version": self.get_catalogue_header_value(catalog, 'MIME-Version'),
              "last-translator": 'Automatic <hi@thorgate.eu>',
              "x-generator": "Python",
              "language": self.get_catalogue_header_value(catalog, 'Language') or locale,
              "lang": locale,
              "content-transfer-encoding": self.get_catalogue_header_value(catalog, 'Content-Transfer-Encoding'),
              "project-id-version": self.get_catalogue_header_value(catalog, 'Project-Id-Version'),
              "pot-creation-date": self.get_catalogue_header_value(catalog, 'POT-Creation-Date'),
              "domain": self.domain,
              "report-msgid-bugs-to": self.get_catalogue_header_value(catalog, 'Report-Msgid-Bugs-To'),
              "content-type": self.get_catalogue_header_value(catalog, 'Content-Type'),
              "plural-forms": self.get_plural(catalog),
              "language-team": self.get_catalogue_header_value(catalog, 'Language-Team')
          }
docs: Populate header with correct data from top-most locale file.