Python gathering messages from different modules

I'm creating a Python application which translates from language A to language B and is accessible through a Flask API. Throughout the translation, several modules can produce multiple messages without aborting the execution, unless a critical error is encountered, i.e. SyntaxError.

From the design point of view, I will need at least two kinds of messages:

class Message(object):
   def __init__(self, message):
      self.message = message

class MessageExtended(Message):
   def __init__(self, message, lineno, linepos)
      super().__init__(message=message)
      self.lineno = lineno
      self.linepos = linepos

The messages should be stored in different lists, i.e. warnings and errors and then returned within a JSON response.

Also I dont want to expose the messages creation to the modules itself. I was more thinking about Factory / Factory method creation.

Should I just create a single instance of let's say MessageBuffer and then pass it as an argument to the constructors? Or should I make it's methods static and import it everywhere I need it? Or is there any other approach (design pattern, ...)?

Thanks for suggestions