languages to redo every chosen language, failed ones included, or list the languages to redo. Send {} to redo every chosen language, or { "languages": ["fr"] } for some. The call returns 202 with queued_languages, the languages now waiting; check progress with Get macro translations.
It fails with 400 when no translation languages are chosen (see Update macro settings), when a listed language is not one of the chosen ones, or when the macro has no translation in a listed language, which is the case for the language the macro is written in.