Replace string replacing with urllib quote replacer

import_md/hedgedoc_import.py

@@ -10,7 +10,7 @@ from zipfile import ZipFile
 
 
 def import_single_document(instance_url, hedgedoc_free_url, content, session_id):
-    sanitized_free_url = hedgedoc_free_url.replace(" ", "%20")
+    sanitized_free_url = urllib.parse.quote(hedgedoc_free_url)
     request_url = instance_url + '/new/' + sanitized_free_url
 
     headers = {"Cookie": f"connect.hedgeDoc.sid={session_id}", "Content-Type": "text/markdown"}