### What problem does this PR solve?
Feat: Add LanguageAbbreviation to simplify language resource files.
#5065
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
Feat: Modify the link address of the agent id #3909
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
Feat: Modify the text of the embedded website button #3909
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
Feat: Modify the data structure of the chunk in the conversation #3909
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### 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>
### What problem does this PR solve?
feat: Expose the agent's chat window to third parties #1842
### Type of change
- [x] New Feature (non-breaking change which adds functionality)