Remove unnecessary YAML declarations

include/i18n/en_US/templates/email/assigned.alert.yaml

include/i18n/en_US/templates/email/message.alert.yaml

include/i18n/en_US/templates/email/message.autoresp.yaml

include/i18n/en_US/templates/email/note.alert.yaml

include/i18n/en_US/templates/email/ticket.alert.yaml

include/i18n/en_US/templates/email/ticket.autoreply.yaml

include/i18n/en_US/templates/email/ticket.notice.yaml

include/i18n/en_US/templates/email/ticket.overdue.yaml

include/i18n/en_US/templates/email/ticket.overlimit.yaml

include/i18n/en_US/templates/email/ticket.reply.yaml

include/i18n/en_US/templates/email/transfer.alert.yaml

include/i18n/en_US/templates/page/landing.yaml

include/i18n/en_US/templates/page/offline.yaml

include/i18n/en_US/templates/page/thank-you.yaml