Remove read only from forms (#3423)

# Description of Changes

Create new tool to remove read-only properties of form fields.

- Added new html file to provide a page for the tool
(misc/unlock-pdf-forms.html), as well as new endpoint
(/unlock-pdf-forms) under config/EndpointConfiguration.java
- Added the tool to the list of "view & edit" tools under the home page
in home-legacy.html and navElements.html
- Mapped the frontend in controller/web/OtherWebController.java
- Created a new controller
(controller/api/misc/UnlockPDFFormsController.java) to handle AcroForm
/Ff flags, /Lock tags and XFA Forms, removing the read-only properties
of all form fields of a PDF document.
- Added language entries to all the language files, to correctly display
the tool's title, header,description, etc.

Closes #2965

---

## Checklist

### General

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] 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

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


![image](https://github.com/user-attachments/assets/2890d3c0-0535-487c-aa0a-83ad9597d898)

![image](https://github.com/user-attachments/assets/631e729c-d68d-4da9-b925-64b5362aeea4)

![image](https://github.com/user-attachments/assets/376a98d5-ca1d-45e9-910f-b5c7639eae8c)



### Testing (if applicable)

- [x] 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.

---------

Co-authored-by: Anthony Stirling <[email protected]>

src/main/resources/messages_el_GR.properties

@@ -1430,3 +1430,9 @@ cookieBanner.preferencesModal.necessary.description=These cookies are essential
 cookieBanner.preferencesModal.analytics.title=Analytics
 cookieBanner.preferencesModal.analytics.description=These cookies help us understand how our tools are being used, so we can focus on building the features our community values most. Rest assured—Stirling PDF cannot and will never track the content of the documents you work with.
 
+home.unlockPDFForms.title=Unlock PDF Forms
+home.unlockPDFForms.desc=Remove read-only property of form fields in a PDF document.
+unlockPDFForms.tags=remove,delete,form,field,readonly
+unlockPDFForms.title=Remove Read-Only from Form Fields
+unlockPDFForms.header=Unlock PDF Forms
+unlockPDFForms.submit=Remove