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/admin/hooks.go

@@ -22,6 +22,7 @@ const (
 func DefaultOrSystemWebhooks(ctx *context.Context) {
 	var err error
 
+	ctx.Data["Title"] = ctx.Tr("admin.hooks")
 	ctx.Data["PageIsAdminSystemHooks"] = true
 	ctx.Data["PageIsAdminDefaultHooks"] = true