content_filter.pl -- Ban list content filter

See also

- https://www.cs.cmu.edu/~biglou/resources/bad-words.txt

- https://www.freewebheaders.com/full-list-of-bad-words-banned-by-google/

 eval_content(+Text, -WordCount, -Score) is det

Evaluate the content of Text. WordCount is the number of non-trivial words and Score is the evaluation.