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/java/stirling/software/SPDF/controller/web/OtherWebController.java

@@ -98,6 +98,13 @@ public class OtherWebController {
         return "misc/change-metadata";
     }
 
+    @GetMapping("/unlock-pdf-forms")
+    @Hidden
+    public String unlockPDFForms(Model model) {
+        model.addAttribute("currentPage", "unlock-pdf-forms");
+        return "misc/unlock-pdf-forms";
+    }
+
     @GetMapping("/compare")
     @Hidden
     public String compareForm(Model model) {

src/main/java/stirling/software/SPDF/controller/web/UploadLimitService.java

@@ -1,32 +1,34 @@
 package stirling.software.SPDF.controller.web;
 
+import java.util.regex.Pattern;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
 import lombok.extern.slf4j.Slf4j;
-import stirling.software.SPDF.model.ApplicationProperties;
 
-import java.util.regex.Pattern;
+import stirling.software.SPDF.model.ApplicationProperties;
 
 @Service
 @Slf4j
 public class UploadLimitService {
 
-    @Autowired
-    private ApplicationProperties applicationProperties;
+    @Autowired private ApplicationProperties applicationProperties;
 
     public long getUploadLimit() {
         String maxUploadSize =
-            applicationProperties.getSystem().getFileUploadLimit() != null
-                ? applicationProperties.getSystem().getFileUploadLimit()
-                : "";
+                applicationProperties.getSystem().getFileUploadLimit() != null
+                        ? applicationProperties.getSystem().getFileUploadLimit()
+                        : "";
 
         if (maxUploadSize.isEmpty()) {
             return 0;
-        } else if (!Pattern.compile("^[1-9][0-9]{0,2}[KMGkmg][Bb]$").matcher(maxUploadSize).matches()) {
+        } else if (!Pattern.compile("^[1-9][0-9]{0,2}[KMGkmg][Bb]$")
+                .matcher(maxUploadSize)
+                .matches()) {
             log.error(
-                "Invalid maxUploadSize format. Expected format: [1-9][0-9]{0,2}[KMGkmg][Bb], but got: {}",
-                maxUploadSize);
+                    "Invalid maxUploadSize format. Expected format: [1-9][0-9]{0,2}[KMGkmg][Bb], but got: {}",
+                    maxUploadSize);
             return 0;
         } else {
             String unit = maxUploadSize.replaceAll("[1-9][0-9]{0,2}", "").toUpperCase();
@@ -41,7 +43,7 @@ public class UploadLimitService {
         }
     }
 
-    //TODO: why do this server side not client?
+    // TODO: why do this server side not client?
     public String getReadableUploadLimit() {
         return humanReadableByteCount(getUploadLimit());
     }