Issue: Dataset download error
Hi @XuhuiZhou,

As @lhoestq has well explained, you need to fork HF's repository, create a feature branch in your fork, push your changes to it and then open a Pull Request to HF's upstream repository. This is so because at HuggingFace Datasets we follow a development model called "Fork and Pull Model". You can find more information here:
- [Understanding the GitHub flow](https://guides.github.com/introduction/flow/)
- [Forking Projects](https://guides.github.com/activities/forking/)

Alternatively, if you find all these steps too complicated, you can use the GitHub official command line tool: [GitHub CLI](https://cli.github.com/). Once installed, in order to create a Pull Request, you only need to use this command:
```shell
gh pr create --web
```
This utility will automatically create the fork, push your changes and open a Pull Request, under the hood.
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? 
 Hi @XuhuiZhou,

As @lhoestq has well explained, you need to fork HF's repository, create a feature branch in your fork, push your changes to it and then open a Pull Request to HF's upstream repository. This is so because at HuggingFace Datasets we follow a development model called "Fork and Pull Model". You can find more information here:
- [Understanding the GitHub flow](https://guides.github.com/introduction/flow/)
- [Forking Projects](https://guides.github.com/activities/forking/)

Alternatively, if you find all these steps too complicated, you can use the GitHub official command line tool: [GitHub CLI](https://cli.github.com/). Once installed, in order to create a Pull Request, you only need to use this command:
```shell
gh pr create --web
```
This utility will automatically create the fork, push your changes and open a Pull Request, under the hood.