The newly released LogicalDOC 4.5.1 improves the processing of ideographic characters using the UTF-8.
Due to changes in system you can use LogicalDOC in Chinese and Greek language and indexing, search for documents in not Latin languages.
The changes affected only the software so you can install this new version directly on an existing deployment.
Also it has been improved the browse by Tag with search on manually entered character.
You can download Chinese localization plug-in from here