See e.g. this comparison which was linked from this search result.
This seems to affect all pages on zh.wp (zhwiki) but not other wikis.
500
You shouldn't be seeing this page. Please report this to User:Σ on enwp. Include the current URL and the text below in your report. If you do not include this information, then there is nothing I can do to help.
Traceback (most recent call last):
File "./app.py", line 33, in inner return func(*a, **kw) File "./app.py", line 110, in timeline_py return tpl.render(store=store) File "/data/project/sigma/www/python/venv/lib/python3.5/site-packages/mako/template.py", line 462, in render return runtime._render(self, self.callable_, args, data) File "/data/project/sigma/www/python/venv/lib/python3.5/site-packages/mako/runtime.py", line 838, in _render **_kwargs_for_callable(callable_, data)) File "/data/project/sigma/www/python/venv/lib/python3.5/site-packages/mako/runtime.py", line 873, in _render_context _exec_template(inherit, lclcontext, args=args, kwargs=kwargs) File "/data/project/sigma/www/python/venv/lib/python3.5/site-packages/mako/runtime.py", line 899, in _exec_template callable_(context, *args, **kwargs) File "timeline_query_mako", line 38, in render_body File "./timeline.py", line 142, in fix_results yield self.history_line(new_line) File "./tool.py", line 117, in history_line urls, ts, stamp, diffword, histword, sizetag, minor, page, summ, top = self.contrib_line(args) File "./tool.py", line 102, in contrib_line stamp = ch_locale(store.lang, ts.strftime, [fmt]) File "./localeshit.py", line 38, in ch_locale raise err
locale.Error: unsupported locale setting