Merge branch 'master-i18n' into 'master'
This is a port of the translations from https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2947
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This is a port of the translations from https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2947