Machine-translate every library on hf.co/docs #879

Tracks rolling out machine-translated docs to every library on hf.co/docs, as discussed on Slack. Once a library's PR is merged and its English docs are rebuilt with a doc-builder that includes #851, a doc-builder PR adds it to the translation job.

English only, other languages machine-translated

• transformers#50120
  • transformers#50168 (removes a duplicate hf_token that #50120 left, which stops main docs builds)
• diffusers#15149
• huggingface_hub#5276
  • doc-builder#881
• smolagents#3091

doc-builder bump

• text-embeddings-inference#956 (also drops languages: en)
• leaderboards#52 (also drops languages: en)
• accelerate#4472
• autotrain-advanced#982
• chat-ui#2738
  • doc-builder#885
• datasets#8905
  • doc-builder#889
• evaluate#842
• hf-endpoints-documentation#180
• huggingface.js#2749
  • doc-builder#882
• lerobot#5141
  • doc-builder#880
• lighteval#1457
• pytorch-image-models#2884
  • doc-builder#886
• transformers.js#1829
• trl#8013
• peft#4072
  • doc-builder#887
• safetensors#896
• Google-Cloud-Containers#177
• optimum-neuron#1143
• Microsoft-Azure#94
• kernels#950 (closed automatically: the repo only accepts PRs from approved contributors)

Calls doc-builder @main, no workflow change

• trackio: doc-builder#890 (its main declares a release version, so pushes to main rebuilt that release and never /main)