Documentation update

Build fix

Version bumps

Sonar refactorings

Merge branch 'feature/9.3.0'

* feature/9.3.0: (33 commits)
  Version bumps
  Version bumps
  Version bumps
  Version bumps
  maven-compiler-plugin only uses <release> now
  Build fix
  Updated version after release
  Re-added missing getMapper method()
  Updated version after release
  Sonar refactorings
  More documentation cleanup
  Documentation cleanup
  Additional MkDocs configuration for showing related timestamps in footer
  All new and updated documentation
  Updated documentation
  Build fix
  Updated documentation
  Version bumps
  Minor configuration refactorings
  Updated documentation
  ...

Re-added missing getMapper method()

Sonar refactorings

Added utility method to retrieve all configured translations / resour…

…ce bundles

Updated readme

Remove invalid character