Release 3.3.1

[kelson42]

• [ ] Merge/apply latest translations from Translatewiki
• [ ] CI is green on git master
• [ ] Kiwix-Build is OK
• [ ] Update the Changelog
• [ ] Update version
• [ ] Create a tag on git
• [ ] Secure new source/sbinaries are published on https://download.kiwix.org/release/kiwix-tools
• [ ] Test Windows binaries work fine
• [ ] Test Linux binaries work fine
• [ ] Update the Github release with the Changelog
• [ ] Create new empty entry in Changelog (placeholder for future entries)
• [ ] Close current milestone and create new one incrementaly (a priori a minor version)
• [ ] Publicize these new versions