wmt19 is broken (zh-en)
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This issue is not reproducible.
2022-05-06T16:27:37Z
https://github.com/huggingface/datasets/issues/3522#issuecomment-1119791575
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2022-05-06T16:27:37Z
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## Describe the bug
A clear and concise description of what the bug is.

## Steps to reproduce the bug
```python
from datasets import load_dataset
dataset = load_dataset("wmt19", 'zh-en')
```

## Expected results
The dataset should download.

## Actual results
`ConnectionError: Couldn't reach ftp://cwmt-wmt:cwmt-wmt@datasets.nju.edu.cn/parallel/casia2015.zip`

## Environment info
- `datasets` version: 1.15.1
- Platform: Linux
- Python version: 3.8 
