* build(docker): compile backend trasnlations during image build
* test(docker): verify compiled backend translations exist in image
Add checks to the "Test Docker Image" step that assert the compiled
django.mo files are present for a few representative languages (de, fr,
ru, zh_Hans). This guards the newly added backend translation
compilation step in the production Dockerfile, ensuring the multilingual
artifacts are produced at the expected locale paths.
* test(docker): verify compiled frontend translations exist in image
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