theme: apply collation when sorting themes (#77217)

It's not perfect but enough to have a usable sorting order.

hobo/theme/utils.py

@@ -16,6 +16,7 @@
 
 import json
 import os
+import unicodedata
 
 from django.conf import settings
 
@@ -38,7 +39,12 @@ def get_themes():
             if not 'module' in theme:
                 theme['module'] = dirname
             themes.append(theme)
-    themes.sort(key=lambda x: x.get('label'))
+
+    def key_function(theme):
+        label = theme.get('label')
+        return unicodedata.normalize('NFKD', label.upper()).encode('ascii', 'ignore').decode()
+
+    themes.sort(key=key_function)
     return themes