feat(frontend): i18n C2 components (config card, tasks panel, execute/import modals, picker)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/i18n/fr.json

@@ -14,7 +14,9 @@
     "create": "Créer",
     "creating": "Création…",
     "close": "Fermer",
-    "confirm": "Confirmer"
+    "confirm": "Confirmer",
+    "yes": "Oui",
+    "no": "Non"
   },
   "nav": {
     "engagements": "Engagements",
@@ -389,7 +391,7 @@
           "commandsRequired": "Aucune commande à exécuter"
         },
         "toast": {
-          "launched": "Tâche C2 lancée"
+          "launched": "{{count}} tâche(s) C2 lancée(s)"
         },
         "error": {
           "launch": "Impossible de lancer la tâche C2"
@@ -409,9 +411,13 @@
         },
         "selected": "sélectionné(s)",
         "empty": "Aucun historique C2 disponible.",
+        "col": {
+          "timestamp": "Horodatage",
+          "completed": "Terminé"
+        },
         "toast": {
-          "imported": "Historique C2 importé",
-          "partial": "Import partiel"
+          "imported": "{{count}} tâche(s) importée(s)",
+          "partial": "{{imported}} importée(s), {{skipped}} déjà attachée(s)"
         },
         "error": {
           "import": "Impossible d'importer l'historique C2"
@@ -421,7 +427,19 @@
         "title": "Sélectionner un agent",
         "empty": "Aucun agent disponible.",
         "hostnameColon": "Hôte :",
-        "lastCheckinColon": "Dernière connexion :"
+        "lastCheckinColon": "Dernière connexion :",
+        "col": {
+          "displayId": "ID",
+          "active": "Actif",
+          "host": "Hôte",
+          "user": "Utilisateur",
+          "domain": "Domaine",
+          "lastCheckin": "Dernière connexion"
+        },
+        "status": {
+          "active": "Actif",
+          "inactive": "Inactif"
+        }
       }
     }
   },