Broken back-translations in model training

[ugermann]

Looks like we're back to square 2 (data is cleaned) for nl-en, en-nl, pl-en, fr-en ...

All trained models (post the backtranslation model)

translation direction	snakemake data dir	status
nl-en	/fs/elli/0nbogoych/data/data/nl-en/snakemake-nl-en/	broken
en-nl	/fs/mimir0/nbogoych/data/data/en-nl/snakemake-en-nl/	broken
pl-en	/fs/surtr0/nbogoych/data/data/pl-en/pl-en-prod/	broken
fr-en	/fs/nanna0/nbogoych/data/data/fr-en/fr-en-prod/	broken