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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---------

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Co-authored-by: Dimitrios Kaitantzidis <james_k23@hotmail.gr>
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README.md

@@ -166,6 +166,13 @@ Note: Podman is CLI-compatible with Docker, so simply replace "docker" with "pod
 
 Please view https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToUseOCR.md
 
+## Reuse stored files
+
+Certain functionality like ``Sign`` Supports pre-saved files stored at ``/customFiles/signatures/``, image files placed within here will be accesable to be used via webUI
+Currently this supports two folder types
+- ``/customFiles/signatures/ALL_USERS`` accessible to all users, useful for orginasations were many users use same files or for users not using authentication
+- ``/customFiles/signatures/{username}`` such as ``/customFiles/signatures/froodle``  accessible to only the ``froodle`` username, private for all others
+
 ## Supported Languages
 
 Stirling PDF currently supports 38!