[XGLUE] Adding new dataset
Oh yes right I didn't notice the train set was always in english sorry.
Moreover it seems that the way this dataset is used is to pick a pretrained multilingual model, fine-tune it on the english train set and then evaluate on each test set (one per language).
So to better fit the usual usage of this dataset, I agree that it's better to have one test split per language. 

Something like your latest example patrick is fine imo :
```python
train_dataset = load_dataset("xglue", "ner", split="train")
test_dataset_de = load_dataset("xglue", "ner", split="test.de")
```

I just replace test-de with test.de since `-` is not allowed for split names (it has to follow the `\w+` regex), and usually we specify the language after a point. 
XGLUE is a multilingual GLUE like dataset propesed in this [paper](https://arxiv.org/pdf/2004.01401.pdf).

I'm planning on adding the dataset to the library myself in a couple of weeks.
Also tagging @JetRunner @qiweizhen in case I need some guidance 
[XGLUE] Adding new dataset 
 XGLUE is a multilingual GLUE like dataset propesed in this [paper](https://arxiv.org/pdf/2004.01401.pdf).

I'm planning on adding the dataset to the library myself in a couple of weeks.
Also tagging @JetRunner @qiweizhen in case I need some guidance  
 Oh yes right I didn't notice the train set was always in english sorry.
Moreover it seems that the way this dataset is used is to pick a pretrained multilingual model, fine-tune it on the english train set and then evaluate on each test set (one per language).
So to better fit the usual usage of this dataset, I agree that it's better to have one test split per language. 

Something like your latest example patrick is fine imo :
```python
train_dataset = load_dataset("xglue", "ner", split="train")
test_dataset_de = load_dataset("xglue", "ner", split="test.de")
```

I just replace test-de with test.de since `-` is not allowed for split names (it has to follow the `\w+` regex), and usually we specify the language after a point. 