Issue: Dataset download error
It would be nice to update the urls indeed !

To do this, you just need to replace the urls in `iwslt2017.py` and then update the dataset_infos.json file with
```
datasets-cli test ./datasets/iwslt2017 --all_configs --save_infos --ignore_verifications
```
The download link in `iwslt2017.py` file does not seem to work anymore.

For example, `FileNotFoundError: Couldn't find file at https://wit3.fbk.eu/archive/2017-01-trnted/texts/zh/en/zh-en.tgz`

Would be nice if we could modify it script and use the new downloadable link?
Issue: Dataset download error 
 The download link in `iwslt2017.py` file does not seem to work anymore.

For example, `FileNotFoundError: Couldn't find file at https://wit3.fbk.eu/archive/2017-01-trnted/texts/zh/en/zh-en.tgz`

Would be nice if we could modify it script and use the new downloadable link? 
 It would be nice to update the urls indeed !

To do this, you just need to replace the urls in `iwslt2017.py` and then update the dataset_infos.json file with
```
datasets-cli test ./datasets/iwslt2017 --all_configs --save_infos --ignore_verifications
```