Improve Case-Insensitive Key Comparison and Path Normalization in Language Properties Check Script (#3067)

# Description of Changes

Please provide a summary of the changes, including:

- Updated key comparison logic in `update_missing_keys` function to be
case-insensitive by converting keys to lowercase before comparison.
- Introduced `os.path.normpath` for file path normalization to improve
cross-platform compatibility.
- Replaced direct usage of `file_path` with `file_normpath` in security
checks, file size validation, and duplicate key detection to ensure
consistent path handling.

These changes improve the robustness and maintainability of the script,
ensuring more accurate language property checks while enhancing security
validation.

---

## 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/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)
- [ ] 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/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.

.github/scripts/check_language_properties.py

@@ -164,7 +164,7 @@ def update_missing_keys(reference_file, file_list, branch=""):
                 if current_entry["type"] == "entry":
                     if ref_entry_copy["type"] != "entry":
                         continue
-                    if ref_entry_copy["key"] == current_entry["key"]:
+                    if ref_entry_copy["key"].lower() == current_entry["key"].lower():
                         ref_entry_copy["value"] = current_entry["value"]
             updated_properties.append(ref_entry_copy)
         write_json_file(os.path.join(branch, file_path), updated_properties)
@@ -199,29 +199,30 @@ def check_for_differences(reference_file, file_list, branch, actor):
     base_dir = os.path.abspath(os.path.join(os.getcwd(), "src", "main", "resources"))
 
     for file_path in file_arr:
-        absolute_path = os.path.abspath(file_path)
+        file_normpath = os.path.normpath(file_path)
+        absolute_path = os.path.abspath(file_normpath)
         # Verify that file is within the expected directory
         if not absolute_path.startswith(base_dir):
-            raise ValueError(f"Unsafe file found: {file_path}")
+            raise ValueError(f"Unsafe file found: {file_normpath}")
         # Verify file size before processing
-        if os.path.getsize(os.path.join(branch, file_path)) > MAX_FILE_SIZE:
+        if os.path.getsize(os.path.join(branch, file_normpath)) > MAX_FILE_SIZE:
             raise ValueError(
-                f"The file {file_path} is too large and could pose a security risk."
+                f"The file {file_normpath} is too large and could pose a security risk."
             )
 
-        basename_current_file = os.path.basename(os.path.join(branch, file_path))
+        basename_current_file = os.path.basename(os.path.join(branch, file_normpath))
         if (
             basename_current_file == basename_reference_file
             or (
                 # only local windows command
-                not file_path.startswith(
+                not file_normpath.startswith(
                     os.path.join("", "src", "main", "resources", "messages_")
                 )
-                and not file_path.startswith(
+                and not file_normpath.startswith(
                     os.path.join(os.getcwd(), "src", "main", "resources", "messages_")
                 )
             )
-            or not file_path.endswith(".properties")
+            or not file_normpath.endswith(".properties")
             or not basename_current_file.startswith("messages_")
         ):
             continue
@@ -292,13 +293,13 @@ def check_for_differences(reference_file, file_list, branch, actor):
         else:
             report.append("2. **Test Status:** ✅ **_Passed_**")
 
-        if find_duplicate_keys(os.path.join(branch, file_path)):
+        if find_duplicate_keys(os.path.join(branch, file_normpath)):
             has_differences = True
             output = "\n".join(
                 [
                     f"      - `{key}`: first at line {first}, duplicate at `line {duplicate}`"
                     for key, first, duplicate in find_duplicate_keys(
-                        os.path.join(branch, file_path)
+                        os.path.join(branch, file_normpath)
                     )
                 ]
             )