[en] move dictionaries to a external dependency

[jaumeortola]

These are the current dictionaries, with no changes, moved to an external dependency.

[jaumeortola]

This works now. There is only a minor issue with the tagging of good/well/best. @AzadehSafakish

I will create a diff with this branch. We cannot merge it without checking the diff.

[AzadehSafakish]

@jaumeortola

I've looked over the diffs in this comment, and I don't see anything major.
I'm approving the PR.

However, to be safe, I'm not sure how I feel about merging this right before the Premium deployment.
Could it be merged after the greenlight for EN deployment tomorrow, so it doesn't go out to Premium users right away?

Also, I just added some words right before reviewing this; I resolved the conflict by adding the new words in added and spelling to the now empty files, but please let me know if I should revert the merge commit and move the new additions somewhere else.

[jaumeortola]

However, to be safe, I'm not sure how I feel about merging this right before the Premium deployment.

I will merge the PR after the Premium sync.