feat: support multi-language

src/graph/types.py

@@ -2,9 +2,10 @@
 # SPDX-License-Identifier: MIT
 
 import operator
+from typing import Annotated
 
 from langgraph.graph import MessagesState
-from typing import Annotated
+
 from src.prompts.planner_model import Plan
 
 
@@ -12,6 +13,7 @@ class State(MessagesState):
     """State for the agent system, extends MessagesState with next field."""
 
     # Runtime Variables
+    locale: str = "en-US"
     observations: Annotated[list[str], operator.add] = []
     plan_iterations: int = 0
     current_plan: Plan | str = None