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BUILD_TRANSLATIONS only takes effect when building the image from source; extending an already-published tag in a small downstream Dockerfile (the pattern already documented on this page) can't add translations after the fact, since non-English files are already stripped out of the published layers. That distinction wasn't documented anywhere, and came up repeatedly in #35959 as real user confusion after 5.0.0 made translations opt-in. Documents the working multi-stage COPY --from pattern a community member worked out in that issue for pulling the compiled translation files out of the superset-node/python-translation-compiler build stages, and clarifies the BUILD_TRANSLATIONS ARG description to point at it.