As a self-publisher, you own all the rights to your work: foreign, translation, movie, audio, etc. If you get picked up by a publisher later on, rights are negotiated during the contract process. They will advise you at the time. Here is some helpful information on foreign/translation rights: https://www.sidebarsaturdays.com/2017/11/11/httpswp-mep7vddb-x3/. As a self-publisher, you would need to speak to an attorney for more information regarding the sale of your rights. If you are offered a contract, you’d also need to speak to a publishing attorney who can go over the contract with you.