Caught by @wxiaoguang in
https://github.com/go-gitea/gitea/pull/23337#issuecomment-1467317742.
Additionally, there were three instances that have the same content as `templates/base/deletion_modal_actions.tmpl` but that are not intended to delete something.
Instead of renaming the template above, these instances were simply re-hard-coded again.
Renaming/improving the template above is left for future PRs.
At the moment, this is only used to replace the color of the `viewed`
checkbox and of the `has changed` label.
Previously, the used variable accentuated always either darker or
lighter, which meant that one theme looked good while the other didn't.
Co-authored-by: silverwind <me@silverwind.io>