Adding PolEval2019 Machine Translation Task dataset
CONTRIBUTOR
**NOTE:**

- Train and Dev: Manually downloaded (auto download is repeatedly giving `ConnectionError` for one of the files), Test: Auto Download
- Dummy test is passing
- The json file has been created with hard-coded paths for the manual downloads _(hardcoding has been removed from the final uploaded script)_
- datasets-cli is still **failing** . It is not picking the right directory for the config. For instance, my folder structure is as below:
 ```
            ~/Downloads/Data/
             |--- English-to-Polish
                   |--- (corresponding files) 
             |--- Russian-Polish
                   |--- (corresponding files) 
```

When ru-pl is selected, ideally it has to search in Russian-Polish folder, but it is searching in '/Downloads/Data/' folder and hence getting a FileNotFound error.

The command run is 
`python datasets-cli test datasets/poleval2019_mt/ --save_infos --all_configs --data_dir ~/Downloads/Data/
`

2020-12-13T19:09:54Z
https://github.com/huggingface/datasets/pull/1547#issuecomment-744053866
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2020-12-14T15:23:23Z
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Hi !
Thanks for the changes :)

The only error left is the dummy data. Since we changed for standard downloads instead of manual downloads its structure changed. Fortunately you can auto-generate the dummy data with this command:

```
datasets-cli dummy_data ./datasets/poleval2019_mt --auto_generate --match_text_files "*"
```

Can you regenerate the dummy data using this command please ?
2020-12-21T10:37:17Z
https://github.com/huggingface/datasets/pull/1547#issuecomment-748902845
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2020-12-21T10:37:17Z
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CONTRIBUTOR
Thank you for the help @lhoestq !! I was generating the dummy dataset in a wrong way! That _--match_text_files "*"_ did the trick! Now all the tests have passed! :-)
2020-12-21T11:31:13Z
https://github.com/huggingface/datasets/pull/1547#issuecomment-748926462
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Hi @vrindaprabhu ! Do you still have the Poleval2019 data files somewhere by any chance ? It appears the google drive URLs are not working anymore
2023-04-01T14:45:36Z
https://github.com/huggingface/datasets/pull/1547#issuecomment-1492990433
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Hi @lhoestq. Just checked. I do not have the backup of the data anywhere. It also appears that PolEval does not repeat its tasks, the data seem to have gone forever. Do you think I should try contacting the organizers for more info?
2023-04-03T05:26:21Z
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We tried already and they don't have the data anymore :(
2023-04-03T09:20:22Z
https://github.com/huggingface/datasets/pull/1547#issuecomment-1493974538
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Facing an error with pytest in training. Dummy data is passing.
README has to be updated.