Wikipedia claims peter and the wolf was formerly in the public domain but placed back under copyright by Golan v. Holder—who is the copyright holder tho?
remembering when i was at a library tech conference in october and an archives guy was like “i would love to get sued because at least then i might learn who took the photograph”
anyway i would argue translation is fair use insofar as “the copyright holder” is not engaged or interested in producing or licencing a translation of their own but consult your lawyer on that