Add info when close from guessing the word

[xavierfav]

When typing the word to guess in the chat, we often do typos, which can be a bit frustrating.
It would be nice to tell users that they are close from the correct answers.
For that we can use string-similarity or similarity to compute the similarity between the word to guess and the one entered by the players with a threshold. When the similarity is above the threshold then display a message saying that it is close from the actual response.