Offline translation (Argos / NLLB)

[marco-beltrame]

Add an offline translation backend so WinLens works without network, without rate limits, and with better privacy. Candidates: Argos Translate or NLLB-200 via ONNX. Should be selectable alongside the current online provider.

[Hao4Wang]

@marco-beltrame https://huggingface.co/spaces/hf-audio/open_asr_leaderboard