Support all the characters in dataset, config and split
For example, a space is an allowed character in a config, while it's not supported in datasets-server.

https://discuss.huggingface.co/t/problem-with-dataset-preview-with-audio-files/31475/3?u=severo

cc @polinaeterna 
Support all the characters in dataset, config and split: For example, a space is an allowed character in a config, while it's not supported in datasets-server.

https://discuss.huggingface.co/t/problem-with-dataset-preview-with-audio-files/31475/3?u=severo

cc @polinaeterna 