Add bot prefix modifier option in extensions

extensions/google_translate/script.py

@@ -20,3 +20,12 @@ def output_modifier(string):
     """
 
     return translator.translate(string, src="en", dest=params['language string']).text
+
+def bot_prefix_modifier(string):
+    """
+    This function is only applied in chat mode. It modifies
+    the prefix text for the Bot and can be used to bias its
+    behavior.
+    """
+
+    return string