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

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* 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: Dimitrios Kaitantzidis <james_k23@hotmail.gr>
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build.gradle

@@ -22,7 +22,7 @@ ext {
 }
 
 group = "stirling.software"
-version = "0.30.1"
+version = "0.31.0"
 
 java {
     // 17 is lowest but we support and recommend 21