diff --git a/app.py b/app.py
index b9e1613..7273675 100644
--- a/app.py
+++ b/app.py
@@ -48,6 +48,7 @@ from sqlalchemy import func, extract, inspect, or_, case, text
 from sqlalchemy.orm import joinedload
 from collections import defaultdict, deque
 from functools import wraps
+
 # from flask_talisman import Talisman # import niżej pod warunkiem
 from flask_session import Session
 from types import SimpleNamespace
@@ -93,16 +94,18 @@ if referrer_policy:
 
 # jak  naglowki wylaczone, nie ładuj talisman z pominięciem referrer_policy
 effective_headers = {
-    k: v for k, v in talisman_kwargs.items()
+    k: v
+    for k, v in talisman_kwargs.items()
     if k != "referrer_policy" and v not in (None, False)
 }
 
 if effective_headers:
     from flask_talisman import Talisman
+
     talisman = Talisman(
         app,
         session_cookie_secure=app.config.get("SESSION_COOKIE_SECURE", True),
-        **talisman_kwargs
+        **talisman_kwargs,
     )
     print("[TALISMAN] Włączony z nagłówkami:", list(effective_headers.keys()))
 else:
@@ -941,19 +944,16 @@ def save_pdf_as_webp(file, path):
 
 def get_active_months_query(visible_lists_query=None):
     if db.engine.name == "sqlite":
-        month_col = func.strftime('%Y-%m', ShoppingList.created_at)
+        month_col = func.strftime("%Y-%m", ShoppingList.created_at)
     else:
-        month_col = func.to_char(ShoppingList.created_at, 'YYYY-MM')
+        month_col = func.to_char(ShoppingList.created_at, "YYYY-MM")
 
     query = db.session.query(month_col.label("month"))
     if visible_lists_query is not None:
         query = query.select_from(visible_lists_query.subquery())
 
     active_months = (
-        query.filter(ShoppingList.created_at != None)
-             .distinct()
-             .order_by("month")
-             .all()
+        query.filter(ShoppingList.created_at != None).distinct().order_by("month").all()
     )
     return [row.month for row in active_months]
 
@@ -1201,6 +1201,7 @@ def file_mtime_filter(path):
         # return datetime.utcnow()
         return datetime.now(timezone.utc)
 
+
 @app.template_filter("todatetime")
 def to_datetime_filter(s):
     return datetime.strptime(s, "%Y-%m-%d")
@@ -1294,8 +1295,7 @@ def main_page():
     def date_filter(query):
         if start and end:
             query = query.filter(
-                ShoppingList.created_at >= start,
-                ShoppingList.created_at < end
+                ShoppingList.created_at >= start, ShoppingList.created_at < end
             )
         return query
 
@@ -1362,14 +1362,11 @@ def main_page():
     if current_user.is_authenticated:
         visible_lists_query = ShoppingList.query.filter(
             or_(
-                ShoppingList.owner_id == current_user.id,
-                ShoppingList.is_public == True
+                ShoppingList.owner_id == current_user.id, ShoppingList.is_public == True
             )
         )
     else:
-        visible_lists_query = ShoppingList.query.filter(
-            ShoppingList.is_public == True
-        )
+        visible_lists_query = ShoppingList.query.filter(ShoppingList.is_public == True)
 
     # Teraz możemy bezpiecznie pobrać miesiące
     month_options = get_active_months_query(visible_lists_query)
@@ -1382,8 +1379,12 @@ def main_page():
             db.session.query(
                 Item.list_id,
                 func.count(Item.id).label("total_count"),
-                func.sum(case((Item.purchased == True, 1), else_=0)).label("purchased_count"),
-                func.sum(case((Item.not_purchased == True, 1), else_=0)).label("not_purchased_count"),
+                func.sum(case((Item.purchased == True, 1), else_=0)).label(
+                    "purchased_count"
+                ),
+                func.sum(case((Item.not_purchased == True, 1), else_=0)).label(
+                    "not_purchased_count"
+                ),
             )
             .filter(Item.list_id.in_(all_ids))
             .group_by(Item.list_id)
@@ -1394,7 +1395,7 @@ def main_page():
             s.list_id: (
                 s.total_count or 0,
                 s.purchased_count or 0,
-                s.not_purchased_count or 0
+                s.not_purchased_count or 0,
             )
             for s in stats
         }
@@ -1409,7 +1410,9 @@ def main_page():
         )
 
         for l in all_lists:
-            total_count, purchased_count, not_purchased_count = stats_map.get(l.id, (0, 0, 0))
+            total_count, purchased_count, not_purchased_count = stats_map.get(
+                l.id, (0, 0, 0)
+            )
             l.total_count = total_count
             l.purchased_count = purchased_count
             l.not_purchased_count = not_purchased_count
@@ -1435,11 +1438,10 @@ def main_page():
         now=now,
         timedelta=timedelta,
         month_options=month_options,
-        selected_month=month_str
+        selected_month=month_str,
     )
 
 
-
 @app.route("/system-auth", methods=["GET", "POST"])
 def system_auth():
     if (
@@ -2191,7 +2193,7 @@ def admin_panel():
     month_str = request.args.get("m")
     if not month_str:
         month_str = datetime.now(timezone.utc).strftime("%Y-%m")
-    show_all = (month_str == "all")
+    show_all = month_str == "all"
 
     if not show_all:
         try:
@@ -2224,10 +2226,12 @@ def admin_panel():
     )
 
     if not show_all and start and end:
-        base_query = base_query.filter(ShoppingList.created_at >= start, ShoppingList.created_at < end)
+        base_query = base_query.filter(
+            ShoppingList.created_at >= start, ShoppingList.created_at < end
+        )
 
     all_lists = base_query.all()
-    
+
     # tylko listy z danych miesięcy
     month_options = get_active_months_query()
 
@@ -2303,7 +2307,7 @@ def admin_panel():
     )
 
     purchased_items_count = Item.query.filter_by(purchased=True).count()
-    
+
     expense_summary = get_admin_expense_summary()
     process = psutil.Process(os.getpid())
     app_mem = process.memory_info().rss // (1024 * 1024)
@@ -2971,6 +2975,7 @@ def admin_mass_edit_categories():
         "admin/mass_edit_categories.html", lists=lists, categories=categories
     )
 
+
 @app.route("/admin/list_items/<int:list_id>")
 @login_required
 @admin_required
diff --git a/templates/admin/mass_edit_categories.html b/templates/admin/mass_edit_categories.html
index b183d84..544f350 100644
--- a/templates/admin/mass_edit_categories.html
+++ b/templates/admin/mass_edit_categories.html
@@ -8,6 +8,11 @@
         <a href="{{ url_for('admin_panel') }}" class="btn btn-outline-secondary">← Powrót do panelu</a>
     </div>
 </div>
+<div class="alert alert-warning border-warning text-dark" role="alert">
+    <strong>Uwaga!</strong> Przypisanie więcej niż jednej kategorii do listy może zaburzyć
+    poprawne zliczanie wydatków, ponieważ wydatki tej listy będą jednocześnie
+    klasyfikowane do kilku kategorii.
+</div>
 
 <form method="post">
     <div class="card bg-dark text-white mb-5">
@@ -20,7 +25,7 @@
                             <th scope="col">Nazwa listy</th>
                             <th scope="col">Właściciel</th>
                             <th scope="col">Data utworzenia</th>
-                            <th scope="col">Podgląd</th>
+                            <th scope="col">Podgląd produktów</th>
                             <th scope="col">Kategorie</th>
                         </tr>
                     </thead>
@@ -34,7 +39,7 @@
                             <td>
                                 <button type="button" class="btn btn-sm btn-outline-info preview-btn"
                                     data-list-id="{{ lst.id }}">
-                                    🔍 Podgląd
+                                    🔍 Zobacz
                                 </button>
                             </td>
                             <td style="min-width: 220px;">