Resolves https://github.com/go-gitea/gitea/issues/26996
Added default sorting for milestones by name.
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
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Conflict resolution: trivial, was due to the improvement made to 'the due
date sorting' strings.
(cherry picked from commit e8d4b7a8b198eca3b0bd117efb422d7d7cac93fe)
Using the Go Official tool `golang.org/x/tools/cmd/deadcode@latest`
mentioned by [go blog](https://go.dev/blog/deadcode).
Just use `deadcode .` in the project root folder and it gives a list of
unused functions. Though it has some false alarms.
This PR removes dead code detected in `models/issues`.
