v458

Merge pull request #3638 from alphagov/dependabot/bundler/terser-1.2.5

v456

Merge pull request #3634 from alphagov/dependabot/bundler/govuk_publi…

v455

Merge pull request #3635 from alphagov/dependabot/bundler/rubocop-gov…

v454

Merge pull request #3630 from alphagov/reinstate-metadata-labels-from…

v453

Merge pull request #3631 from alphagov/dependabot/bundler/govuk_app_c…

v452

Merge pull request #3633 from alphagov/revert-3626-simplify-email-ale…

v451

Merge pull request #3629 from alphagov/revert-3627-derive-metadata-la…

v450

Merge pull request #3626 from alphagov/simplify-email-alert-title-bui…

v449

Merge pull request #3627 from alphagov/derive-metadata-labels-from-al…

v448

Merge pull request #3628 from alphagov/dependabot/bundler/govuk_app_c…