Fix YAML metadata: remove conversational, set active train split for Dataset Viewer

Delete old data/train/bci_train-00001-of-00009.parquet

Delete old data/train/bci_train-00000-of-00009.parquet

Publication multilingue (train): train-00000-of-00009.parquet

BCI traduction: bci_train-00001-of-00009.parquet

BCI traduction: bci_train-00000-of-00009.parquet

Publication dataset multilingue HuggingFaceTB/smoltalk (10000 exemples, 7 directions)

initial commit