'Pass control over to trans and render ``template_filename``.
:type   trans:              ``galaxy.web.framework.webapp.GalaxyWebTransaction``
:param  trans:              transaction doing the rendering
:type   plugin:             ``util.bunch.Bunch``
:param  plugin:             the plugin containing the template to render
:type   template_filename:  string
:param  template_filename:  the path of the template to render relative to
``plugin.template_path``
:returns:       rendered template'

def fill_template(self, trans, plugin, template_filename, **kwargs):

    return trans.fill_template(template_filename, template_lookup=plugin.template_lookup, **kwargs)
