When the paper is submitted and accepted you are still the Author, but the copyright may be transferred from you to the publisher, see the copyright details in the contract.
Therefore, your question is not about plagiarism rather about copyright.
You have to have official permision to publish the paper elsewhere from the actual copyright holder(s) and the terms must be approved by the second (third, fourth,...) publisher as well. It is allways good to inform all the groups involved. Asking the owners is a must.
Regarding the self-plagiarism; you have to refer to the first paper. The later one(s) can be referred only as translations of the first one.
There are four options what you can be accused of:
- Nothing: All owners and new publishers are informed and granted the permissions and you clearly state that the later papers are just translations of Paper #1;
- Self plagiarism: All owners and publishers granted the permissions but you are referring the papers as separate works;
- Copyright violation: The owner of the copyright of the original paper is not aware of the translation but you refer to this paper in later papers stating it is translation only;
- Self plagiarism and copyright violation: You hide the information that paper #2 is just translation of #1 to all owners, publishers and society.