give an error when training with wrong keywords for a modifer

[RussellSPG]

Feature Request

When training an agent using a modifier, it trains without errors even though it's given a wrong keyword. I think it would be appropriate to give an error in the conversation window, and not allow to train with "Your modifier, is using a keyword that does not match" or to that nature. In my case, I'm training a modifier with a toppings keyword attached instead of making a Confirm keyword. Its wrong, and this is for the purpose of the break script.