Update en-de models

[kpu]

The en-de models submitted to WMT21 were trained without guided alignment. They are in /fs/alvis0/heafield/student (base) and /fs/surtr0/heafield/student-tiny11 (tiny11).

1. Retrain with guided alignment (find alignments or make them on the parallel data). See train.sh
2. Make 8-bit and lexical shortlists
3. Post here

[kpu]

Updated en-de models posted, thanks @kaleidoescape

        "checksum": "7f6bdcf60555fca479e014a6722729b34890e52ca8bfbffb5138f574ec91aec7",
        "url": "http://data.statmt.org/bergamot/models/deen/ende.student.base.tar.gz",

        "checksum": "5214a434a8b6d0562eb927ff5ffe42d4a60240370a0095e0c1369d960878254f",
        "url": "http://data.statmt.org/bergamot/models/deen/ende.student.tiny11.tar.gz",

cc @andrenatal @lonnen