Release PortaBase 2.3

[jmbowman]

• Design and implement new features
• Fix all release-blocking bugs
• Update packaging/version_number
• Update packaging/copyright_years
• Run packaging/update_help_translation_templates.py and commit the results
• Inform translators that a release is coming soon
• Update the Debian man page
• Manually test all the release candidate builds from the latest GitHub Actions workflow run
• Renew Apple Developer Program account
• Renew Windows code signing certificate
• Merge the latest translation pull requests from Transifex
• Update README.txt
• Prepare summary of changes for use in announcements
• Update screenshots on the PortaBase web site
• Update CHANGES with new version and release date
• Update debian/changelog with new version and release date
• Build source tarball
• Build Ubuntu 24.04 package
• Build AAB for upload to Google Play
• Build signed macOS disk images (Intel and ARM)
• Build signed Windows installer
• Tag the release in git
• Update online help files
• Release in Google Play
• Create GitHub Releases entry
• Update the download page on the PortaBase web site
• Update the history page on the PortaBase web site
• Update the translations page on the PortaBase web site
• Update the To Do page on the PortaBase web site
• Update the file format page on the PortaBase web site, if needed
• Update the XML format page on the PortaBase web site, if needed
• Announce on PortaBase homepage
• Announce on HackerNews

[jmbowman]

If anyone wants to help test the release candidate packages, please grab them from the "Artifacts" section of the latest entry on https://github.com/jmbowman/portabase/actions and let me know how it goes. I also plan to start creating a proper automated test suite after this release, please get in touch on #42 if you'd like to help with that; there are many ways to help ranging from suggesting test cases, to providing small test data files, to actually helping code the tests.