Update app.py

app.py

@@ -10,7 +10,7 @@ from Gradio_UI import GradioUI
 # Below is an example of a tool that does nothing. Amaze us with your creativity !
 @tool
 def days_between_dates(date1: str, date2: str) -> str:
-    """计算两个日期相差多少天 (YYYY-MM-DD).
+    """Calculates how many days are between two dates (YYYY-MM-DD).
     Args:
         date1: 第一个日期.
         date2: 第二个日期.