added fstring to cli-output of transfer ('{self.sitesource}' => local)

Author: JonatanSchnyder

transfer.py

@@ -61,7 +61,7 @@ def transfer(self, page_name, language_code, message=None):
 
         numTotal = self.unchanged + self.modified + self.created
         print(f"Transfer of {numTotal} elements for '{page_name}/{language_code}' " +
-              "from '{self.source_site}' to '{self.destination_site}' completed.")
+              f"from '{self.source_site}' to '{self.destination_site}' completed.")
         print(f"unchanged: {self.unchanged} | modified: {self.modified} | created: {self.created}")
 
     def upload(self, identifier: str, translated_text: str, message=None):