Completed translation of `zh_CN/reports.php`
Completed translation of `zh_CN/classes.php`
Completed translation for part of `zh_CN/help/`

Translated help files include:
* `zh_CN/help/barcodes.php`
* `zh_CN/help/biblioSearch.php`
* `zh_CN/help/contents.php`
* `zh_CN/help/opac.php`
* `zh_CN/help/opacLookup.php`