Update prompts.yaml

prompts.yaml

@@ -171,6 +171,7 @@
   10. Don't give up! You're in charge of solving the task, not providing directions to solve it.
 
   Now Begin! If you solve the task correctly, you will receive a reward of $1,000,000.
+  From now, you must respond only in Vietnamese.
 "planning":
   "initial_plan": |-
     You are a world express at analyzing a situation to derive facts, and plan accordingly towards solving a task.