* Initial Japanese translation
Only a small part was translated
* Unspecified words will be in English
When new words are added, they will be displayed in English even if Japanese support is delayed.
* Expanded translation scope
* Expanded translation scope
* Proceed with translation with a focus on overall settings
* Re-translated the outdated settings screen
* Add items that only exist in the latest en_US and remove items that do not exist in en_US
* A lot of translation work done
* A lot more translation work has been done
* ja_JP.axaml has been translated into Japanese
* Fixed three incomplete parts of the Japanese translation
* remove dotnet-tool.json because the project does not rely on any dotnet tools.
* remove Directory.Build.props because the solution has only one project.
* move src/SourceGit to src. It's not needed to put all sources into a subfolder of src since there's only one project.