--- calibre-5.10.1/setup/translations.py.orig	2021-02-10 10:29:11.518360983 +0100
+++ calibre-5.10.1/setup/translations.py	2021-02-10 10:37:37.017022669 +0100
@@ -159,7 +159,7 @@
                             f.seek(0), f.truncate(), f.write('\n'.join(lines).encode('utf-8'))
                             break
                     else:
-                        raise SystemExit(f'Failed to add file_filter for {slug=} to config file')
+                        raise SystemExit(f'Failed to add file_filter for slug= to config file')
                 self.git('add .tx/config')
             self.upload_pot(resource=slug)
             self.git(['add', dest])