add english language tags for ~100 datasets
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Fixing the tags of all the datasets is out of scope for this PR so I'm merging even though the CI fails because of the missing tags
2021-06-04T08:51:47Z
https://github.com/huggingface/datasets/pull/2442#issuecomment-854493874
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2021-06-04T08:51:47Z
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As discussed on Slack, I have manually checked for ~100 datasets that they have at least one subset in English. This information was missing so adding into the READMEs.

Note that I didn't check all the subsets so it's possible that some of the datasets have subsets in other languages than English...