It looks like that variable="editor translator" means selecting two variables., and editortranslator is a term rather than a variable?
See also NameVariable in citationberg::taxonomy - Rust.
EDIT on 2026-01-04: According to taxonomy.rs - source, editortranslator is an alias for editor-translator.
#[serde(rename_all = "kebab-case")]
pub enum NameVariable {
#[serde(alias = "editortranslator")]
EditorTranslator,
// …
}