🌐 Sync Translations + Update README Progress Table (#2907)

### Description of Changes

This Pull Request was automatically generated to synchronize updates to
translation files and documentation. Below are the details of the
changes made:

#### **1. Synchronization of Translation Files**
- Updated translation files (`messages_*.properties`) to reflect changes
in the reference file `messages_en_GB.properties`.
- Ensured consistency and synchronization across all supported language
files.
- Highlighted any missing or incomplete translations.

#### **2. Update README.md**
- Generated the translation progress table in `README.md`.
- Added a summary of the current translation status for all supported
languages.
- Included up-to-date statistics on translation coverage.

#### **Why these changes are necessary**
- Keeps translation files aligned with the latest reference updates.
- Ensures the documentation reflects the current translation progress.

---

Auto-generated by [create-pull-request][1].

[1]: https://github.com/peter-evans/create-pull-request

---------

Co-authored-by: stirlingbot[bot] <195170888+stirlingbot[bot]@users.noreply.github.com>

src/main/resources/messages_zh_CN.properties

@@ -768,7 +768,6 @@ autoSplitPDF.selectText.3=上传单个大型扫描的 PDF 文件，让 Stirling
 autoSplitPDF.selectText.4=分隔页会自动检测和删除，确保最终文档整洁。
 autoSplitPDF.formPrompt=提交包含 Stirling-PDF 分隔页的 PDF：
 autoSplitPDF.duplexMode=双面模式（正反面扫描）
-autoSplitPDF.dividerDownload1=下载“自动拆分分隔页（最小化）.pdf”
 autoSplitPDF.dividerDownload2=下载“自动拆分分隔页（带指导说明）.pdf”
 autoSplitPDF.submit=提交