[Node Docs & Terms] On adding a term that contains a special character like a dash "-", this one is ignored and not displayed

When a term that contains a special character ("'", "-", ...) is added in docs, this one is ignored and not displayed on terms list.

And the score of these terms is always to zero.

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• Here is a term with a dash:

  

• Here the term is displayed without the special char and tis score is 0!: