CT-1829 ignore external_deadline_copy and sub_heading i18n keys
CT-1829 ignore external_deadline_copy and sub_heading i18n keys

Their use is now obfuscated by "translate_for_case", sorry i18n-tools.

ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff