Fix typo in en.yml
Fix typo in en.yml

Minor correction to have the il8n for `:issue_not_shipped` more accurately reflect that concept
nebulab/spree-subscriptions,mcsweeneys/solidus_subscriptions,mcsweeneys/solidus_subscriptions,nebulab/spree-subscriptions,mcsweeneys/solidus_subscriptions,nebulab/spree-subscriptions