Support proper ranking for polyphonic (Chinese) characters

[crliu95]

There are polyphonic characters that have more than one pronounciations in language like Chinese. And this feature affects how entries of literature beginning with these characters are ranked in the bibliography.

There are already some discussions in a Github project, which aims for creating certain CSL styles to handle citations of Chinese literature in a proper way. See zotero-chinese/styles#152 .

Unfortunately, however, tricks in CSL styles could not solve this issue unless the underlying protocol changes.