创建新主题的时候，出现如下的错误，出现频率很多呀

Traceback (most recent call last):
File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/webapp/__init__.py", line 511, in __call__
handler.get(*groups)
File "/base/data/home/apps/newsuzhouke/1.345115857577685916/topic.py", line 61, in get
template_values['page_title'] = site.title + u' › ' + l10n.create_new_topic
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe5 in position 0: ordinal not in range(128)