fix: translate remaining pantry UI (print button, manager, print page)

pantry-page-header's Print button, the pantry-manager add/remove
form (item name, qty, unit, expiry badges), and the print/pantry
page (title, column headers, item count, empty state, footer) were
all hardcoded English.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/web/messages/fr.json

@@ -494,7 +494,24 @@
   "pantry": {
     "title": "Garde-manger",
     "subtitle": "Suivez ce que vous avez en stock",
-    "canCook": "Que puis-je cuisiner ?"
+    "canCook": "Que puis-je cuisiner ?",
+    "itemNamePlaceholder": "Nom de l'article",
+    "qtyPlaceholder": "Qté",
+    "unitPlaceholder": "Unité",
+    "add": "Ajouter",
+    "addFailed": "Échec de l'ajout",
+    "removeFailed": "Échec de la suppression",
+    "empty": "Aucun article dans le garde-manger.",
+    "expired": "Expiré",
+    "expiresInDays": "Expire dans {days}j",
+    "expiresOn": "Expire le {date}",
+    "printItemCountSingular": "{count} article",
+    "printItemCountPlural": "{count} articles",
+    "noItems": "Aucun article dans le garde-manger.",
+    "colItem": "Article",
+    "colQuantity": "Quantité",
+    "colExpires": "Expire",
+    "expiredDaysAgo": "Expiré il y a {days}j"
   },
   "feed": {
     "title": "Fil d'actualité",