Update i18n.json

Co-authored-by: Copilot <[email protected]>

Author: Harsh9934-debug

i18n.json

@@ -33,7 +33,8 @@
     "model": "gemini-2.5-pro",
     "prompt": "Translate from {source} to {target}. Output raw JSON only.",
     "settings": {
-      "temperature": 0
+      "temperature": 0,
+      "response_mime_type": "application/json"
     }
   },
   "$schema": "https://lingo.dev/schema/i18n.json"