### What problem does this PR solve?
- [x] New Feature (non-breaking change which adds functionality)
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Co-authored-by: Yingfeng <yingfeng.zhang@gmail.com>
Co-authored-by: Jin Hai <haijin.chn@gmail.com>
…lay reference symbols for documents in external chat boxes #566#577
### What problem does this PR solve?
fix: display the current language directly at the top and do not display
reference symbols for documents in external chat boxes #566#577
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
* feat: Modify the color of the svg icon in the header according to the selected state
* feat: add translation icon to header
* feat: shorten the route length of the knowledge base
* feat: extract routing information from the knowledge base into constants
