Addition of the Show JavaScript tool (#4877)

# Description of Changes

- Added the show javascript tool.

---

## Checklist

### General

- [ ] 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/devGuide/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/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] 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/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### Translations (if applicable)

- [ ] I ran
[`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md)

### 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/devGuide/DeveloperGuide.md#6-testing)
for more details.

frontend/public/locales/en-GB/translation.json

@@ -99,6 +99,8 @@
   "unpin": "Unpin File (replace after tool run)",
   "undoOperationTooltip": "Click to undo the last operation and restore the original files",
   "undo": "Undo",
+  "back": "Back",
+  "nothingToUndo": "Nothing to undo",
   "moreOptions": "More Options",
   "editYourNewFiles": "Edit your new file(s)",
   "close": "Close",
@@ -2753,7 +2755,14 @@
     "title": "Show Javascript",
     "header": "Show Javascript",
     "downloadJS": "Download Javascript",
-    "submit": "Show"
+    "submit": "Show",
+    "results": "Result",
+    "processing": "Extracting JavaScript...",
+    "done": "JavaScript extracted",
+    "singleFileWarning": "This tool only supports one file at a time. Please select a single file.",
+    "view": {
+      "title": "Extracted JavaScript"
+    }
   },
   "redact": {
     "tags": "Redact,Hide,black out,black,marker,hidden,auto redact,manual redact",
@@ -4587,6 +4596,12 @@
     }
   },
   "common": {
+    "previous": "Previous",
+    "next": "Next",
+    "collapse": "Collapse",
+    "expand": "Expand",
+    "collapsed": "collapsed",
+    "lines": "lines",
     "copy": "Copy",
     "copied": "Copied!",
     "refresh": "Refresh",