Support external file scheme .e.g S3 and make the entity itself translatable

First of all thank you for this useful module, meanwhile when I try use this module for s3 storage it fails due using the FileSystem::realpath, as per documentation "The use of this method is discouraged, because it does not work for remote URIs ..." , also it will be very handy to support translation, going to attach a patch to add those couple of features