Add parameter '--eval-sacrebleu-args' for translation task and re-fix #4689.

[BrightXiaoHan]

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• [x] Was this discussed/approved via a Github issue? (no need for typos, doc improvements)
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• [ ] Did you write any new necessary tests?

What does this PR do?

Fixes #4690 and #4689.

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[BrightXiaoHan]

Hi, @gwenzek, could you please help me review this PR?