fix multiple language downloading in mC4
MEMBER
The CI failure is unrelated to your PR and fixed on master, merging :)
2022-01-18T19:10:15Z
https://github.com/huggingface/datasets/pull/3594#issuecomment-1015737393
https://api.github.com/repos/huggingface/datasets/issues/3594
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2022-01-18T19:10:15Z
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If we try to access multiple languages of the [mC4 dataset](https://github.com/huggingface/datasets/tree/master/datasets/mc4), it will throw an error. For example, if we do 
```python
mc4_subset_two_langs = load_dataset("mc4", languages=["st", "su"])
```
we got
```
FileNotFoundError: Couldn't find file at https://huggingface.co/datasets/allenai/c4/resolve/1ddc917116b730e1859edef32896ec5c16be51d0/multilingual/c4-st+su.tfrecord-00000-of-00002.json.gz
```
Now it should work. Check it (from the root dir of a project): 
```python
mc4_subset_two_langs = load_dataset("./datasets/mc4/", languages=["st", "su"])
```