Update URL of tatoeba subset of xtreme
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<s>To be more precise: `os.path.join` is replaced on-the-fly by `xjoin` anyway with patching, to extend it to remote files</s>
2021-11-26T10:05:04Z
https://github.com/huggingface/datasets/pull/3321#issuecomment-979843811
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2021-11-26T10:06:25Z
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MEMBER
Oh actually just ignore what I said: they were used to concatenate URLs, which is not recommended. Let me fix that again by appending using `+`
2021-11-26T10:06:15Z
https://github.com/huggingface/datasets/pull/3321#issuecomment-979844608
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2021-11-26T10:22:16Z
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Updates the URL of the tatoeba subset of xtreme. Additionally, replaces `os.path.join` with `xjoin` to correctly join the URL segments on Windows.

Fix #3320 