Update Chinese translations in messages_zh_CN.properties (#3653)

# Description of Changes

- **What was changed:** Improved and completed the Simplified Chinese
(zh_CN) translations in `messages_zh_CN.properties`
- **Why the change was made:** To provide full and accurate localization
for Chinese users and improve the user experience.
- **Challenges encountered:** None

> [!NOTE]
> The below summary is generated by Github Copilot:

This pull request updates the Chinese translation file
(`messages_zh_CN.properties`) with comprehensive translations for
various application strings, replacing English text with accurate
Chinese equivalents. The changes enhance localization and improve the
user experience for Chinese-speaking users.

### Localization Updates

#### General Language Translations:
* Replaced English language names with their Chinese counterparts for
all supported languages in the application. For example, `lang.ara` was
changed from "Arabic" to "阿拉伯语".

#### Feature-Specific Translations:
* Updated PDF-related feature strings, such as `getPdfInfo`,
`sanitizePDF`, and `compress`, with Chinese translations for headers,
descriptions, and settings. For instance, `getPdfInfo.summary` was
changed from "PDF Summary" to "PDF 摘要".
[[1]](diffhunk://#diff-96642f7f84844ca3ff72a89cad109fa1dd6a6db834e414bdabd30ba3887751b1L810-R831)
[[2]](diffhunk://#diff-96642f7f84844ca3ff72a89cad109fa1dd6a6db834e414bdabd30ba3887751b1L899-R902)
[[3]](diffhunk://#diff-96642f7f84844ca3ff72a89cad109fa1dd6a6db834e414bdabd30ba3887751b1L1123-R1124)

#### Tool and Interface Labels:
* Translated interface labels like "Undo" and "Redo" to "撤销" and "重做",
respectively, in the multi-tool section. Similarly, "Page Select" was
translated to "页面选择".
[[1]](diffhunk://#diff-96642f7f84844ca3ff72a89cad109fa1dd6a6db834e414bdabd30ba3887751b1L1173-R1175)
[[2]](diffhunk://#diff-96642f7f84844ca3ff72a89cad109fa1dd6a6db834e414bdabd30ba3887751b1L1189-R1190)

#### New Feature Translation:
* Added translations for the "Fake Scan" feature, including headers,
descriptions, and advanced settings, such as "Brightness" ("亮度") and
"Contrast" ("对比度").
* Added translations for the "EML To PDF" feature, including title,
headers, descriptions, and advanced settings, such as "Convert" ("转换")
and "Maximum attachment size (MB)" ("附件大小上限（MB）").

#### Error and Notification Messages:
* Translated system messages, such as
`login.relyingPartyRegistrationNotFound`, from "No relying party
registration found" to "未找到依赖方注册信息".

---

## Checklist

### General

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md)
(if applicable)
- [x] I have performed a self-review of my own code
- [x] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.

stirling-pdf/src/main/resources/messages_zh_CN.properties

@@ -265,7 +265,7 @@ enterpriseEdition.button=升级到 Pro 版本
 enterpriseEdition.warning=此功能仅适用于 Pro 版本
 enterpriseEdition.yamlAdvert=Stirling PDF Pro支持YAML配置文件和其他SSO功能。
 enterpriseEdition.ssoAdvert=寻找更多的用户管理功能？查看Stirling PDF Pro
-enterpriseEdition.proTeamFeatureDisabled=Team management features require a Pro licence or higher
+enterpriseEdition.proTeamFeatureDisabled=团队管理功能需要 Pro 许可证或更高版本
 
 
 #################
@@ -346,8 +346,8 @@ account.property=属性
 account.webBrowserSettings=Web 浏览器设置
 account.syncToBrowser=同步账户 -> 浏览器
 account.syncToAccount=同步账户 <- 浏览器
-account.adminTitle=Administrator Tools
-account.adminNotif=You have admin privileges. Access system settings and user management.
+account.adminTitle=管理员工具
+account.adminNotif=您具有管理员权限，可访问系统设置和用户管理。
 
 
 adminUserSettings.title=用户控制设置
@@ -378,38 +378,38 @@ adminUserSettings.activeUsers=激活用户:
 adminUserSettings.disabledUsers=禁用用户:
 adminUserSettings.totalUsers=总用户:
 adminUserSettings.lastRequest=最后登录
-adminUserSettings.usage=View Usage
-adminUserSettings.teams=View/Edit Teams
-adminUserSettings.team=Team
-adminUserSettings.manageTeams=Manage Teams
-adminUserSettings.createTeam=Create Team
-adminUserSettings.viewTeam=View Team
-adminUserSettings.deleteTeam=Delete Team
-adminUserSettings.teamName=Team Name
-adminUserSettings.teamExists=Team already exists
-adminUserSettings.teamCreated=Team created successfully
-adminUserSettings.teamChanged=User's team was updated
-adminUserSettings.totalMembers=Total Members
-adminUserSettings.confirmDeleteTeam=Are you sure you want to delete this team?
+adminUserSettings.usage=查看使用情况
+adminUserSettings.teams=查看/编辑团队
+adminUserSettings.team=团队
+adminUserSettings.manageTeams=管理团队
+adminUserSettings.createTeam=创建团队
+adminUserSettings.viewTeam=查看团队
+adminUserSettings.deleteTeam=删除团队
+adminUserSettings.teamName=团队名称
+adminUserSettings.teamExists=该团队已存在
+adminUserSettings.teamCreated=团队成功创建
+adminUserSettings.teamChanged=用户所属团队已更新
+adminUserSettings.totalMembers=成员总数
+adminUserSettings.confirmDeleteTeam=您确定要删除此团队吗？
 
-teamCreated=Team created successfully
-teamExists=A team with that name already exists
-teamNameExists=Another team with that name already exists
-teamNotFound=Team not found
-teamDeleted=Team deleted
-teamHasUsers=Cannot delete a team with users assigned
-teamRenamed=Team renamed successfully
+teamCreated=团队成功创建
+teamExists=该名称的团队已存在
+teamNameExists=已有其他团队使用该名称
+teamNotFound=未找到该团队
+teamDeleted=团队已删除
+teamHasUsers=无法删除有成员的团队
+teamRenamed=团队重命名成功
 
 # Team user management
-team.addUser=Add User to Team
-team.selectUser=Select User
-team.warning.moveUser=Warning: This will move the user from "{0}" team to "{1}" team. Are you sure?
-team.confirm.moveUser=Are you sure you want to move this user from "{0}" team to "{1}" team?
-team.userAdded=User successfully added to team
-team.back=Back to Teams
-team.internal=Internal Team
-team.internalTeamNotAccessible=The Internal team is a system team and cannot be accessed
-team.cannotMoveInternalUsers=Users in the Internal team cannot be moved to other teams
+team.addUser=添加用户到团队
+team.selectUser=选择用户
+team.warning.moveUser=警告：这将把用户从"{0}"团队移至"{1}"团队。是否确定？
+team.confirm.moveUser=您确定要将该用户从"{0}"团队移至"{1}"团队吗？
+team.userAdded=用户已成功添加至团队
+team.back=返回团队列表
+team.internal=内部团队
+team.internalTeamNotAccessible=内部团队为系统预设，无法访问
+team.cannotMoveInternalUsers=内部团队中的用户无法转移至其他团队
 
 
 
@@ -1200,7 +1200,7 @@ merge.header=合并多个 PDF（2个以上）。
 merge.sortByName=按名称排序
 merge.sortByDate=按日期排序
 merge.removeCertSign=删除合并文件的数字签名吗？
-merge.generateToc=Generate table of contents in the merged file?
+merge.generateToc=在合并文件中生成目录吗？
 merge.submit=合并
 
 
@@ -1410,9 +1410,9 @@ changeMetadata.selectText.5=添加自定义元数据条目
 changeMetadata.submit=更改
 
 #unlockPDFForms
-unlockPDFForms.title=Remove Read-Only from Form Fields
-unlockPDFForms.header=Unlock PDF Forms
-unlockPDFForms.submit=Remove
+unlockPDFForms.title=移除表单字段只读属性
+unlockPDFForms.header=解锁 PDF 表单
+unlockPDFForms.submit=移除
 
 #pdfToPDFA
 pdfToPDFA.title=PDF 转 PDF/A
@@ -1688,19 +1688,19 @@ fakeScan.resolution=分辨率（DPI）
 
 
 # Table of Contents Feature
-home.editTableOfContents.title=Edit Table of Contents
-home.editTableOfContents.desc=Add or edit bookmarks and table of contents in PDF documents
+home.editTableOfContents.title=编辑目录
+home.editTableOfContents.desc=为 PDF 文档添加或编辑目录和书签
 
-editTableOfContents.tags=bookmarks,toc,navigation,index,table of contents,chapters,sections,outline
-editTableOfContents.title=Edit Table of Contents
-editTableOfContents.header=Add or Edit PDF Table of Contents
-editTableOfContents.replaceExisting=Replace existing bookmarks (uncheck to append to existing)
-editTableOfContents.editorTitle=Bookmark Editor
-editTableOfContents.editorDesc=Add and arrange bookmarks below. Click + to add child bookmarks.
-editTableOfContents.addBookmark=Add New Bookmark
-editTableOfContents.desc.1=This tool allows you to add or edit the table of contents (bookmarks) in a PDF document.
-editTableOfContents.desc.2=You can create a hierarchical structure by adding child bookmarks to parent bookmarks.
-editTableOfContents.desc.3=Each bookmark requires a title and target page number.
-editTableOfContents.submit=Apply Table of Contents
+editTableOfContents.tags=书签,目录,导航,索引,章节,小节,结构,大纲
+editTableOfContents.title=编辑目录
+editTableOfContents.header=添加或编辑 PDF 目录
+editTableOfContents.replaceExisting=替换现有书签（取消勾选则追加至原书签）
+editTableOfContents.editorTitle=书签编辑器
+editTableOfContents.editorDesc=在下方添加并排列书签，点击 + 可添加子书签
+editTableOfContents.addBookmark=添加书签
+editTableOfContents.desc.1=此工具可用于在 PDF 文档中添加或编辑目录（书签）
+editTableOfContents.desc.2=您可以通过为父书签添加子书签来构建层级结构
+editTableOfContents.desc.3=每个书签需填写标题和目标页码
+editTableOfContents.submit=应用目录