'Define queue_len, arial_label and code mirror exit message context variables'

def _extra_context(self):

    _ = self.capa_system.i18n.ugettext
    return {'queue_len': self.queue_len, 'aria_label': _('{programming_language}    editor').format(programming_language=self.loaded_attributes.get('mode')), 'code_mirror_exit_message': _('Press    ESC    then    TAB    or    click    outside    of    the    code    editor    to    exit')}
