Update data card: corrected stats after MOSEL duration backfill

Backfill MOSEL duration in train/train-00006-of-00027.parquet from VoxPopuli unlabelled_v2.tsv (100% resolved)

Backfill MOSEL duration in train/train-00005-of-00027.parquet from VoxPopuli unlabelled_v2.tsv (100% resolved)

Delete validation/conversion_summary.log

Delete test/conversion_summary.log

Delete train/conversion_summary.log

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Update README.md

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