Update `French` translation

Currently translated at 4.7% (6 of 126 strings)

Translation: Wiki-Bot/Dashboard
Translate-URL: https://translate.wikibot.de/projects/wiki-bot/dashboard/fr/

dashboard/i18n/fr.json

@@ -5,5 +5,8 @@
         " ",
         " ",
         " "
-    ]
+    ],
+    "general": {
+        "delete": "Supprimer"
+    }
 }