Rename "Billing Cycle" to "App usage cycle".

Under Settings > Data Usage, rename "Billing cycle" to
"Data warning & limit".

In the new "Data warning & limit" screen rename "Billing cycle"
to "App usage cycle".

Bug: 74321150
Test: manual
Change-Id: Ied4fd604fe98f5fc613fd4f7fc3a3bea5908bb7c
2 files changed