It is italicized because that's exactly what the wikitext says:
''Fusion of Music and Calendar 乐律融通''

This is not in line with the best practice of writing Chinese.

I'd agree with this on a Chinese Wikipedia, however not sure if that would help readers on an English Wikipedia which might not be used to best practices of writing Chinese.

I'm tempted to close this as WONTFIX as coming up with some code might be more work (and introduce more problems) than ignoring the current problem...

bugzilla wrote:

I'd agree with this on a Chinese Wikipedia, however not sure if that would help

readers on an English Wikipedia which might not be used to best practices of
writing Chinese.

Yes, I understand your arguments, also I don't have an overview of how complicated it would be to implement a solution.

However, there's still no reason for the Chinese text to be italicized, since it makes it unreadable. The Chinese text in the title is there so that an English reader can use it to identify the title in Chinese if he/she sees it, not as an exotic decoration. Therefore it's important that it can actually be read, which I would say is not the case if it is italicized.

It is natural for the editor of English Wikipedia to include also the Chinese name of the title inside of '':s, since the style manual says that work titles should be inside of '':s. Therefore it's also logical that such a wikitext will produce a graphically pleasing result for the reader.

(In reply to comment #2)

However, there's still no reason for the Chinese text to be italicized, since
it makes it unreadable.

Correct, however I see the right way to fix this by editing wikipages which have it wrong.