Disambiguation in kfet's permission handling

In some places we used to refer to permissions based on their codename
only (the part after the dot "." in the following examples) which can be
ambiguous. Typically, we might define permissions like "bds.is_team" or
"cof.is_team" in the near future ;)

kfet/views.py

@@ -3,6 +3,7 @@ import heapq
 import statistics
 from collections import defaultdict
 from decimal import Decimal
+from typing import List
 from urllib.parse import urlencode
 
 from django.contrib import messages
@@ -993,15 +994,19 @@ def kpsul_update_addcost(request):
     return JsonResponse(data)
 
 
-def get_missing_perms(required_perms, user):
-    missing_perms_codenames = [
-        (perm.split("."))[1] for perm in required_perms if not user.has_perm(perm)
-    ]
-    missing_perms = list(
-        Permission.objects.filter(codename__in=missing_perms_codenames).values_list(
-            "name", flat=True
+def get_missing_perms(required_perms: List[str], user: User) -> List[str]:
+    def get_perm_description(app_label: str, codename: str) -> str:
+        name = Permission.objects.values_list("name", flat=True).get(
+            codename=codename, content_type__app_label=app_label
         )
-    )
+        return "[{}] {}".format(app_label, name)
+
+    missing_perms = [
+        get_perm_description(*perm.split("."))
+        for perm in required_perms
+        if not user.has_perm(perm)
+    ]
+
     return missing_perms