[IMP] Subscriptions: updated Billing Period language and others #14787
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This updates the Billing Period language on the subscriptions page to flow more logically and more accurately describe what the Billing Period checkbox actually does. This update also adds clarity to the "Align to Period Start" example and a note that custom period start dates are not available by default.
This 18.0 PR can FWP up to master.
Forward-Port-Of: #14784