Adds Regulation Publication sub-type
Regenerate translation keys
Actions PR comments

* Moves Notice and Decision pub sub-types into "Less common" group
* Removes unneeded additional type verification from publications controller test
* Moves regulation locale key into a more appropriate alphabetical ordering
Merge pull request #1721 from alphagov/pub-sub-type-regulations-for-maa

Add publication sub-type of `Regulation` for the Military Aviation Authority (MAA)