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Code cleanup (+ 1 bug fixed in html.py due to a variable name).
Allow replacements in terms at the start and/or end of a text.
Replaces only the first occurence of each term.
Replaces only terms surrounded with non-alphanumeric characters.
Forbids replacements in some tags, classes and ids.
Adds a filter for local use.
Adds a ValidationError if neither "definition" and "link" aren't filled.
Remove a newline that was added to every replaced term.
Term.description -> Term.definition.
Error in README.rst.