https://github.com/infiniflow/ragflow/issues/2503


### 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._

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

Before:

<img width="611" alt="image"
src="https://github.com/user-attachments/assets/02a3a1ee-7bfb-4fe0-9b15-11ced69cc8a3">

After:

<img width="796" alt="image"
src="https://github.com/user-attachments/assets/371136af-8d16-47aa-909b-26609d3ad60e">

<img width="557" alt="image"
src="https://github.com/user-attachments/assets/9268362f-2b6a-4ea1-9fe7-659f7292e5e1">

https://github.com/infiniflow/ragflow/issues/2496

### 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._

### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [ ] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [x] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

### What problem does this PR solve?

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?

OpenAITTS

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: liuhua <10215101452@stu.ecun.edu.cn>
Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

### What problem does this PR solve?


Add VolcEngine to create api_key format error
When constructing the json string, there was an extra "," at the end,
which caused a formatting error. This commit fixed the problem.


### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### Type of change
#2485
- [x] Performance Improvement

### What problem does this PR solve?

#2467

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?

#1102

### Type of change

- [x] Performance Improvement

---------

Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

### What problem does this PR solve?

#2465

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?

Fixes the _superuser_ `admin@ragflow.io` not being accessible due to how
entered passwords are used. Unless this is expected behavior?

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?


### Type of change

- [x] Performance Improvement

### What problem does this PR solve?


### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

### What problem does this PR solve?

#2467

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?

_This PR addresses the need to describe the "Switch" component across
different languages and corrects a misleading description for a
placeholder message not exclusively tied to a specific assistant type.
By providing clearer and more accurate descriptions, this PR aims to
improve user understanding and usability of the Switch component and the
"Message Resume Assistant..." placeholder in a multilingual context._

### Explanation of Changes

1. **Added Descriptions for "Switch" Component**: 
- Descriptions were added for the "Switch" component in three different
locales:
- **English (EN)**: Provides a concise description of what the "Switch"
component does, focusing on its ability to evaluate conditions and
direct the flow of execution.
- **Simplified Chinese (ZH)**: Translated the English description into
Simplified Chinese to cater to users who prefer this locale.
- **Traditional Chinese (ZH-Traditional)**: Added a Traditional Chinese
version of the description to support users in regions that use
Traditional Chinese.
   
2. **Corrected "Message Resume Assistant..." to "Message the
Assistant..."**:
- Updated the description from "Message Resume Assistant..." to "Message
the Assistant..." in the English locale. This correction makes the
description more generic and accurate, reflecting the placeholder's
broader functionality, which is not limited to Resume Assistants. It now
clearly communicates that the placeholder can be used with various types
of assistants, not just those related to resumes.

### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)
- [x] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

### What problem does this PR solve?

feat: When voice is turned on, the page will not display an empty reply
message when the answer is empty #1877

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

feat: If the tts model is not set, the Text to Speech switch is not
allowed to be turned on #1877

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

#2441 

### Type of change


- [x] Documentation Update

### What problem does this PR solve?

#2441 

### Type of change

- [x] Documentation Update

### What problem does this PR solve?

feat: After the voice in the new conversation window is played, jump to
the tab of the conversation #1877

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?


### Type of change

- [x] Documentation Update

### What problem does this PR solve?


### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?

feat: Supports text output and sound output #1877

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

feat: Add html to the description text of the parsing method general
#336

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

feat: Display mindmap in drawer #2247

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

#2402

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?


### Type of change

- [x] Performance Improvement

### 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._

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

### What problem does this PR solve?

[#1987](https://github.com/infiniflow/ragflow/issues/1987)

When scanning PDF files character by character, the parser excluded
spaces if the string did not match regex. Text from [Russian
documents](https://github.com/user-attachments/files/16659706/dogovor_oferta.pdf)
needs spaces, but it does not match the regex because it uses different
alphabet. That's why PDFs were parsed incorrectly and were almost
unusable as source. Fixed that by adding Russian alphabet to regex.

There might be problems with other languages that use different
alphabets. I additionally tested [PDF in
Spanish](https://www.scusd.edu/sites/main/files/file-attachments/howtohelpyourchildsucceedinschoolspanish.pdf?1338307816)
and old [a-zA-Z...] regex parses it correctly with spaces.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?


### Type of change

- [x] Documentation Update

### What problem does this PR solve?

#2415

### Type of change

- [x] Performance Improvement

### What problem does this PR solve?


### Type of change

- [x] Documentation Update

### What problem does this PR solve?

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?

#2415

### Type of change

- [x] Performance Improvement

### What problem does this PR solve?



### Type of change

- [x] Documentation Update

### What problem does this PR solve?

feat: When the mindmap data is empty, it will not be displayed on the
search page #2247
### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

feat: Modify the style of the answer card on the search page #2247

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

feat: Use Spin to wrap the chunk list on the search page #2247
### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

### What problem does this PR solve?

#2356

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?

feat: Click on the chunk on the search page to locate the corresponding
file location #2247

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

feat: Wrap the searched chunk with a Popover #2247

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

#2379 

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?

 feat: Add component AkShare #1739

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

feat: Add component WenCai #1739

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?
#2247

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

feat: Use Tree to display the knowledge base list on the search page
#2247
### Type of change

- [x] New Feature (non-breaking change which adds functionality)

https://github.com/infiniflow/ragflow/issues/2356

### What problem does this PR solve?

As title

### Type of change

- [X] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

Add a default value for do_refer in Dialog

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

---------

Co-authored-by: liuhua <10215101452@stu.ecun.edu.cn>

### What problem does this PR solve?

feat: Cover the entire search page with a background image #2247

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### 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._

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>