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: GitHub Action <action@github.com>

---------

Signed-off-by: GitHub Action <action@github.com>
Co-authored-by: Dimitrios Kaitantzidis <james_k23@hotmail.gr>
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Co-authored-by: a <a>
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src/main/resources/messages_pt_PT.properties

@@ -80,6 +80,7 @@ pro=Pro
 page=Page
 pages=Pages
 loading=Loading...
+addToDoc=Add to Document
 
 legal.privacy=Privacy Policy
 legal.terms=Terms and Conditions
@@ -808,6 +809,11 @@ sign.draw=Desenhar Assinatura
 sign.text=Inserir Texto
 sign.clear=Limpar
 sign.add=Adicionar
+sign.saved=Saved Signatures
+sign.save=Save Signature
+sign.personalSigs=Personal Signatures
+sign.sharedSigs=Shared Signatures
+sign.noSavedSigs=No saved signatures found
 
 
 #repair