Resolve startup warning "application.langs is deprecated, use play.i18n.langs instead"

[ljdelight]

The application.conf has application.langs="en,af,fr,es" causing this warning:

23:07:06.197 WARN [][application-akka.actor.default-dispatcher-5][play.api.i18n.Lang] - application.langs is deprecated, use play.i18n.langs instead

I'm not aware of any localized code on the backend side but this is the migration guide https://www.playframework.com/documentation/2.9.x/MessagesMigration26