Revert "Moved language help to new features"

This reverts commit 5d315b65c6543fa5314db4a0dd471e619468e251.

@chrismdp there's something funny going on with Aruba and UTF-8. I
presume these features are passing on your machine, and I can see
they're passing on Travis, but they fail on my machine.

See https://github.com/cucumber/aruba/pull/151 for details.

I'm reverting this commit while we sort this out.
Merge pull request #460 from chrismdp/migrate-star-notation

Migrate star-notation feature to new structure
Merge two features for the rerun formatter.

Closes #464
Merge branch 'pr/464'
Delete multiple snippet languages feature/message