Follow #23290
Network error won't make content lost. And this is a much better
approach than "loading-button".
The UI is not perfect and there are still some TODOs, they can be done
in following PRs, not a must in this PR's scope.
<details>
</details>
The admin config page has been broken for many many times, a little
refactoring would make this page panic.
So, add a test for it, and add another test to cover the 500 error page.
Co-authored-by: Giteabot <teabot@gitea.io>
Change all license headers to comply with REUSE specification.
Fix#16132
Co-authored-by: flynnnnnnnnnn <flynnnnnnnnnn@github>
Co-authored-by: John Olheiser <john.olheiser@gmail.com>
