Add support for other languages for rouge
@alexyalunin 

I did something similar for others languages.

[Repo: rouge-metric](https://github.com/m3hrdadfi/rouge-metric)
I calculate rouge with
```
from datasets import load_metric
rouge = load_metric("rouge")
rouge_output = rouge.compute(predictions=['тест тест привет'], references=['тест тест пока'], rouge_types=[
    "rouge2"])["rouge2"].mid
print(rouge_output)
```
the result is
`Score(precision=0.0, recall=0.0, fmeasure=0.0)`
It seems like the `rouge_score` library that this metric uses filters all non-alphanueric latin characters 
in `rouge_scorer/tokenize.py` with `text = re.sub(r"[^a-z0-9]+", " ", six.ensure_str(text))`.
Please add support for other languages. 