Replaces a material: name is required, and every other field left out is cleared (category, description, the image and the units to null, isRecycled/isSynthetic to 0) — except translations (en/es/de/fr), whose sent languages are merged over the stored ones. Also renames the material's raw-material product category, publishes a newly attached image, and re-syncs the category into the style types. Responds with the record as GET /:id returns it. 404 material_not_found for an unknown id.