Shorten the given text to ``max_size``

        * synopsis: ``%shorten{text}`` or ``%shorten{text,max_size}``
        * example: ``%shorten{$title,32}``
        * description: Shorten “text” on word boundarys.

def tmpl_shorten(text, max_size=32):
        """Shorten the given text to ``max_size``

        * synopsis: ``%shorten{text}`` or ``%shorten{text,max_size}``
        * example: ``%shorten{$title,32}``
        * description: Shorten “text” on word boundarys.
        """
        max_size = int(max_size)
        if len(text) <= max_size:
            return text
        text = textwrap.wrap(text, max_size)[0]
        import re
        text = re.sub(r'\W+$', '', text)
        return text.strip()