Chinese translation unnumbered chapter links not working

[FinYang]

I cannot view the unnumbered chapters of the fpp3 Chinese translation.

For example, when I am at the Chinese site, https://otexts.com/fpp3cn/, if I click on 附录：使用R in the table of content, which is Appendix: Using R, I expect to go to
https://otexts.com/fpp3cn/appendix-using-r.html
but instead, the link becomes
https://otexts.com/fpp3cn/#附录使用-r
which does not work because it treats the Chinese chapter name as a section within the page.

The same goes for all other unnumbered chapters as well, preface, translations, etc. The link becomes the current page + a Chinese header, instead of the page for the chapter.

[robjhyndman]

Thanks. It should now be fixed. Let me know if you spot any other similar issues