Added Opus TedTalks
CONTRIBUTOR
@lhoestq I saw some common changes you made on the other PR's (Similar Opus Datasets). I fixed those changes here. Can you please review it once ? 
Thanks.
2020-12-17T18:14:09Z
https://github.com/huggingface/datasets/pull/1555#issuecomment-747609450
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2020-12-17T18:14:09Z
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merging since the CI is fixed on master
2020-12-18T09:44:26Z
https://github.com/huggingface/datasets/pull/1555#issuecomment-747986149
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Dataset : http://opus.nlpl.eu/TedTalks.php