Add main landmark to templates and adjust titles (#22670)

* Add main aria landmark to templates
 * Adjust some titles to improve understanding of location in navigation

Contributed by @Forgejo

routers/web/user/setting/adopt.go

@@ -17,7 +17,7 @@ import (
 
 // AdoptOrDeleteRepository adopts or deletes a repository
 func AdoptOrDeleteRepository(ctx *context.Context) {
-	ctx.Data["Title"] = ctx.Tr("settings")
+	ctx.Data["Title"] = ctx.Tr("settings.adopt")
 	ctx.Data["PageIsSettingsRepos"] = true
 	allowAdopt := ctx.IsUserSiteAdmin() || setting.Repository.AllowAdoptionOfUnadoptedRepositories
 	ctx.Data["allowAdopt"] = allowAdopt