Update config.json

config.json

@@ -31,4 +31,7 @@
   "vocab_size": 256206,
   "tokenizer_class": "NllbTokenizer",
   "max_length": 200
+  "task_specific_params":{
+    "translation": {"src_lang": "fr", "tgt_lang": "en"}
+  }
 }