Hello,
This will be fixed in the new version of the platform.
Meanwhile you can download a correct file from https://www.mql5.com/files/docs/mt5/mql5/chm/mql5_chinese.chm or use the online version https://www.mql5.com/zh/docs
Thank you reporting.

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MQL5 Reference is normal in the English version but the title in the Chinese version is empty
How to let the Metaquotes know this ?