unicode normalize in sanitize function

delojza.py

@@ -8,6 +8,7 @@ import re
 import shutil
 import sys
 import tempfile
+import unicodedata
 from configparser import ConfigParser
 from datetime import datetime, timedelta
 from glob import glob
@@ -92,10 +93,12 @@ class DelojzaBot:
                 return True
         return False
 
+    # https://github.com/django/django/blob/master/django/utils/text.py#L393
     @staticmethod
     def sanitize(filepath):
         if filepath is None:
             return None
+        filepath = unicodedata.normalize('NFKD', filepath).encode('ascii', 'ignore').decode('ascii')
         return re.sub(r'[^\w.()\[\]{}#-]', '_', filepath)
 
     def tag_file(self, filepath, message, info=None):