update prompt

prompts.py

@@ -129,7 +129,13 @@ Example: "조 바이든 대통령" → "former President Joe Biden"
 In office since October 1, 2024 (current)
 Example: "기시다 총리" → "Prime Minister Shigeru Ishiba"
 
-# Important: Do not add month information or specific dates that are not present in the original Korean text.
+# CRITICAL DATE TRANSLATION RULE
+**NEVER ADD SPECIFIC MONTH INFORMATION NOT PRESENT IN ORIGINAL TEXT**
+Maintain the vagueness of temporal references when present in source
+Example:
+- 지난달 → "last month"
+- 이번달 → "this month"
+- 지난달 16일 → "on the 16th of last month"
 
 #VERIFICATION
 CRITICAL WARNING: Failure to follow these rules will result in incorrect translation.