[v7.0/forgejo] Add optional pronoun field in user settings (#3076)

**Backport:** https://codeberg.org/forgejo/forgejo/pulls/1518

An attempt at adding an optional pronoun field for user profiles, as suggested here 3 years ago: https://github.com/go-gitea/gitea/issues/13990

![A Forgejo profile showing pronouns to the right of the user's username](/attachments/2e5ff300-d333-46db-9074-f030f199843c)

I made this for [my own instance](https://git.gay/h) and didn't initially think I'd make a PR because of the previous closed issue, but I thought I'd ask the Forgejo matrix chat to see if there was any support and there was!

I'm told I should make a database migration, some help as to how to do that would be appreciated.

Co-authored-by: hazycora <hazysu@riseup.net>
Co-authored-by: Gergely Nagy <forgejo@gergo.csillger.hu>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/3076
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: forgejo-backport-action <forgejo-backport-action@noreply.codeberg.org>
Co-committed-by: forgejo-backport-action <forgejo-backport-action@noreply.codeberg.org>

routers/api/v1/admin/user.go

@@ -236,6 +236,7 @@ func EditUser(ctx *context.APIContext) {
 		Website:                 optional.FromPtr(form.Website),
 		Location:                optional.FromPtr(form.Location),
 		Description:             optional.FromPtr(form.Description),
+		Pronouns:                optional.FromPtr(form.Pronouns),
 		IsActive:                optional.FromPtr(form.Active),
 		IsAdmin:                 optional.FromPtr(form.Admin),
 		Visibility:              optional.FromNonDefault(api.VisibilityModes[form.Visibility]),