Update button strings for new design

Updates the positive button strings see
mocks here:

https://screenshot.googleplex.com/6hLciwYTPMsYytt
https://screenshot.googleplex.com/ASAotxvEHnrDodq

Implementation:

https://hsv.googleplex.com/4658122816749568
https://hsv.googleplex.com/5590705238966272

Bug: 322074376
Change-Id: I8488d4b9414448bfbfc9462fe5450681bfbbfbdb
Test: flash device