Feature/save signs (#2127)

* apply fix

* Fixes empty th:action

* Update build.gradle

* fix

* formatting

* Save signatures

* Fix code scanning alert no. 42: Uncontrolled data used in path expression

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

* fix UserServiceInterface

* Merge branch 'feature/saveSigns' of
git@github.com:Stirling-Tools/Stirling-PDF.git into feature/saveSigns

* 0.31.0 bump and further csrf

* formatting

* preview name

* add

* sign doc

* Update translation files (#2128)

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Co-authored-by: GitHub Action <action@github.com>

---------

Signed-off-by: GitHub Action <action@github.com>
Co-authored-by: Dimitrios Kaitantzidis <james_k23@hotmail.gr>
Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>
Co-authored-by: a <a>
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src/main/resources/static/js/fetch-utils.js

@@ -0,0 +1,29 @@
+window.fetchWithCsrf = async function(url, options = {}) {
+    function getCsrfToken() {
+        const cookieValue = document.cookie
+            .split('; ')
+            .find(row => row.startsWith('XSRF-TOKEN='))
+            ?.split('=')[1];
+        
+        if (cookieValue) {
+            return cookieValue;
+        }
+        
+        const csrfElement = document.querySelector('input[name="_csrf"]');
+        return csrfElement ? csrfElement.value : null;
+    }
+
+    // Create a new options object to avoid modifying the passed object
+    const fetchOptions = { ...options };
+    
+    // Ensure headers object exists
+    fetchOptions.headers = { ...options.headers };
+    
+    // Add CSRF token if available
+    const csrfToken = getCsrfToken();
+    if (csrfToken) {
+        fetchOptions.headers['X-XSRF-TOKEN'] = csrfToken;
+    }
+
+    return fetch(url, fetchOptions);
+}