### What problem does this PR solve?
_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._
Issue link:#[[Link the issue
here](https://github.com/infiniflow/ragflow/issues/236)]
### Type of change
- [x] Documentation Update
### What problem does this PR solve?
Fix broken link of discord invitation
Issue link:#227
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
- [x] Documentation Update
Suggested some minor translation updates to improve readability.
### What problem does this PR solve?
Suggested some minor translation updates to improve readability.
Issue link:#[Link the issue here]
### Type of change
- [ ] Bug Fix (non-breaking change which fixes an issue)
- [ ] New Feature (non-breaking change which adds functionality)
- [ ] Breaking Change (fix or feature that could cause existing
functionality not to work as expected)
- [x] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Test cases
- [ ] Python SDK impacted, Need to update PyPI
- [ ] Other (please describe):
