Hi Hubert,
Coming off of the launch of the new version, localization is one of the next things that we are looking at to expand the userbase of SecureAPlus.
We are actually looking people who are willing to do volunteer translation work for SecureAPlus. If you're interested in contributing to a Polish translation, please let us know.
We are preparing a streamlined process to let people who are keen on doing this to be able to submit translations of SecureAPlus.