Flake8 whitespace; add translate; change use 'is None' not = Changed out some strings like: _("foo bar bas....") into _( "foo" "bar bas") to handle long lines. Verified both forms result in the same string extraction using locale tools xgettext/xpot. Added a couple of translation marks.

def audit_html_files(db, cl, nodeid, newvalues):
    if 'type' in newvalues and newvalues['type'] == 'text/html':
        newvalues['type'] = 'text/plain'
    

def init(db):
    db.file.audit('set', audit_html_files)
    db.file.audit('create', audit_html_files)